I’ve only really seen AMD CPUs actually burn up or even explode. You can find many articles and videos on it if you like. Actually reminded me of a throwback to an old school TomsHardware article.
https://www.tomshardware.com/reviews/hot-spot,365-6.html
Anyway, the fact that this builder has a whole system failure rate higher than 1% in the first 5 years is just crazy. We have just under 10 thousand Dell fixed workstations (not including our mobile notebooks/tablets) that get used in a variety of environments. We order them with a 5 year warranty and cycle them out in batches quarterly just as they reach the end of there service dates. Various models all with Intel Core and Xeon processors. In a whole year we might have 5-10 service calls to Dell for repairs on these and it’s usually the motherboard or RAM and also the power supply but less so. Maybe had one failed CPU in the last 3 years. The system was about 4 years old and the motherboard died as well. There are also drive failures of course, but we handle those in house since the old drives have to be destroyed. Luckily this dropped considerably with the switch to SSDs some years back, although 1-2 still fail per year.
The point being that this builder might want to keep its own realized failure rates to itself. Not a very inspiring look.