I suppose it depends on the company, and the product being made. If the volume is high enough it makes sense to automate.
Here is an automated desktop assembly line (Making Lenovos):
View: https://www.youtube.com/watch?v=GNqNVgLk1Mg
Here's a clip of a Gigabyte factory making motherboards, very people heavy.
View: https://www.youtube.com/watch?v=bR-DOeAm-PQ
I know ASUS has nearly fully automated PCB production in place. Mostly people reloading part placement machines and then doing the testing and packaging.
PC assembly, even laptops, has been people powered for a long time. OEMs like Dell use Foxconn.
If you can customize it, you can assume it was...