At least take a good look over the data before writing inaccurate information like this. To start...
In total, the data set covers 44,100 AMD cards sold and an impressive 76,280 Nvidia GPU, so it is clear that German buyers prefer Nvidia GPUs.
Considering Nvidia's graphics card sales worldwide seem to outpace AMD's by a larger margin than that, I would say AMD's cards appear to be quite well received there. As for those total sales numbers though, you are comparing apples to oranges, as a lot of those Nvidia cards don't currently have any direct competition from AMD. They include 8,890 2080 Tis, 8,320 2080 SUPERs, and 1,620 2080s, all cards that AMD doesn't provide any direct competition against, and for anyone wanting a card faster than a 5700 XT, they had no real choice but to go with Nvidia. Those 30,030 2070 SUPERs are a bit above AMD's current product range too, so if we look at only the price levels where both AMD and Nividia are directly competing, then AMD's sales actually appear to be higher than Nvidia's at that retailer. 12,780 2060 SUPERs vs 29,340 5700 XTs, and 7,760 2060s vs 8,910 5700s.
The 1660 Ti appears to outnumber the 5600 XT by a decent margin, but that brings up a rather important question. When is this sales data actually from? Are these all-time sales? If that's the case, then that would include nearly an extra year of sales numbers for many of the Nvidia cards. Even if it's limited to a year of data, then AMD only had the 5500 XT and 5600 XT available for half that time. The data certainly doesn't support the article's claim that "German buyers prefer Nvidia GPUs".
As for the reliability numbers, I get the impression that the retailer would only be providing data for returns performed directly through them. So, that might not even include long-term failures where the buyer would probably contact the manufacturer directly, and most of these cards haven't even been on the market long enough to show any indication of how long-term durability might compare. These returns could be primarily for minor things like coil whine, relatively high temperatures (as might be expected from the blower-style reference 5700s and 5700 XTs available near launch), or maybe just the person's power supply not being able to cope well with a higher-end card. There are lots of reasons someone might send a card back.
And perhaps most importantly, as the bottom chart indicates and as was already pointed out above, these numbers might be more meaningful for comparing the actual manufacturers of the cards, not comparing AMD to Nvidia. PowerColor's return numbers far outpace any other manufacturer (at least with the units sold at this particular retailer), and since they only produce AMD cards, that alone threw off the AMD numbers by a significant margin. If we exclude PowerColor's cards and add up the sales and returns of the other manufacturers, they come much closer to Nvidia's result. Nvidia's cards had a somewhat less extreme outlier with Palit, but they made up a much smaller percentage of sales at that retailer, so they didn't throw off the final numbers nearly as much.
And furthermore, these only apply to specific models within those brands. PowerColor's 5700 and 5700 XT Red Devil and Red Dragon cards had high RMA rates in the 6-13% range, but their other models sold at that retailer, even for the 5700 XT, were at around 2% or less. In fact, no other models of AMD cards ended up higher than 5% in their data. However, 8 out of 18 models of the 2080 Ti fell into a similar 6-11% range, as did 1 of the 3 models of the 2080 at 8%, and 1 of the 4 models of the 2070 at 13%, all from a variety of manufacturers. Though each of those manufacturers also had other cards at low rates. Clearly it makes a lot more sense to be looking at the specific models of cards that showed high RMA rates, rather than making a blanket statement that AMD's 5000-series cards had a higher rate based primarily on a couple models of cards from one manufacturer.
So, in short, this article is based on misinterpreted data, with a questionable, click-bait title. And while the data itself is actually kind of interesting, there are some notable gaps when it comes to details, like when these sales and returns were from, or what reasons the returns were for. At best, we can analyze the return numbers for specific models of cards and see how they compare to others, and even that only applies to the specific shipments of cards sent to this specific retailer.
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