Depends on whether it's typical or more of an outlier. As an outlier, it's not unreasonable for a 100k person company that includes manufacturing and R&D in multiple countries and involving products intended for multiple industries. There tend to be organizational boundaries that coincide with these geographic, market, and functional splits.
What's the largest team you've personally been a part of, over a span of multiple years? If you have managerial experience, what's the largest team you've personally managed, again over a span of multiple years? What kind of work were your direct reports doing?
The reason I ask is that it's actually hard to effectively manage teams that are too large. If the typical org chart depth is 5, for a company of 100k, that means the typical team size would be about 10 people. That's usually realistic.
Now, if we take a company like Walmart, with its 2.1M employees, then a 5-deep org chart would mean the typical manager must have about 19 direct reports. That's pretty nuts.
In context of the article I was referencing engineering organizations. However, I've studied business and think that thin vertical structures could work with other businesses as well, the optimal size might be slightly larger, but I don't think it has to get extremely deep.
I've run several teams over my career for some very large companies some for smaller companies. The teams sizes varied from 4 to 30. For the 30 people it was for a very poorly run automotive company, I did the job for 3 years, the team fluctuated up and down but 30 was the average. 2/3rds of the team was offshore resources which made it a 24 hour job largely, not to mention all of the "cross-functional" teams that one interacted with daily. When I was a director of engineering (software) at a very large fortune 500 company for 6 years before going it on my own and consulting. People load depends on the project and how it's run. When I was a director I had 6 different managers under me which each operated a different products with in the portfolio. Those teams were often 8 to 15 people each. Those managers often had a lead engineer, lead QA and lead designer that helped with duties, but did not have direct reports. Above me was a VP and the CTO. This company did everything from engines of various types, water filtration, energy transmission and distribution equipment and software, etc. I was a director in their energy software group which was very vast in what it did. No where in the company was I aware of an 8 layer deep management chain, but it doesn't mean it didn't exist somewhere. It was deeper in some segments, field engineering management who we worked with in a segment of software comes to mind, but even there, it was a more horizontal structure than vertical. Luckily this company preferred product focused management structures which likely lead more horizontal management alignments. A lot of software companies get into the business of non-product based structures having a managers/directors for the developers, a managers/directors for the project managers, a managers/directors for the QA team, a managers/directors for the UX/UI Design, etc. Then trying to throw a product/program owner into the mix which also has their own manager(s) which makes things a fragmented mess and leads to super deep structures with only a few people reporting to each manager which has sadly become common. I suspect this is what happened at Intel in some form or fashion.
In the WalMart case a lot of those 2.1 million employees are spread over 10000 ish different stores and various functions like WalMart Labs, Jet, Art.com, etc. The largest segment of employees comes from the physical store side, I can imagine you have a store manager who manages the internal logistics of that store, just like a plant manager would manage an assembly plant. A store manager for WalMart likely has things broken down over segments, produce, stock, product delivery, store to customer delivery, cashiers, etc. which all likely have their own manager. Each region likely has a manger and then their is probably and overall director for the regions. COO->Country (US, Mexico, UK, etc.) Brick and Mortar VP->Regional Manager->Store Manager->Store Function Manager->IC. This structure would be 6 deep which would be about 18 people per manager. If you wanted to break that up, one could argue inserting a VP over sub country spans or sub-regional manager or a sub function manger to thin it out to about 11 people per manager, but it's plausible and still only 7 deep. I doubt this is what WalMart's actual structure is, but functionally I believe either would be manageable for WalMart which has about 20x the number of employees of Intel who apparently was 8 deep in some levels.