
Not the greatest guide. 2 and 3 shouldn’t be causing overheating unless you are running a potato. I don’t know the impact of 4, but I can’t imagine that its much on modern PCs. 1 and 5 are the only real advice. Blocked vents and dust are the other two good points, everything else seems questionable. Tab overload isn’t a problem anymore, both Chrome and Firefox manage and deactivate tabs you haven’t recently used.

Dedicated GPUs were pretty common in the 2000s, they were required for most games, unlike the 90s where it was an unstandardized wild west. The failure rate had to be higher, I know I had 3 cards die with less than 2 years use on each card in the 2000s. Cases back then had terrible airflow and graphic demands jumped quickly.
Usually they don’t have more money than they know what to do with, what money have have gets funnelled into their addiction, the rest becomes debt.