Linus's setup doesn't make much sense economically but the concept works. You don't have to go to the extreme end of available CPUs. 64-cores for 4 machines = 16 cores per machine, which is overkill, especially for gaming.
If you go for a 12 or 16 core Threadripper like the 2920X or 2950X you're only looking at $425/$690, which is $106/$173 per "PC".
Combine that with the savings you get from not having to buy 4 cases, PSUs and motherboards and I think a multi-head threadripper setup will end up significantly cheaper than buying 4 machines.
If you go for a 12 or 16 core Threadripper like the 2920X or 2950X you're only looking at $425/$690, which is $106/$173 per "PC".
Combine that with the savings you get from not having to buy 4 cases, PSUs and motherboards and I think a multi-head threadripper setup will end up significantly cheaper than buying 4 machines.