I’m sure Richard Ames had good intentions when he made this video, but it is complete and utter nonsense. He knows a lot about Windows computers, but nothing about VST. He noticed a few things about his particular setup, which is rather unusual, drew some incorrect conclusions, then made things worse by overgeneralizing to assume this is relevant to other DAW users.
He completely misunderstands the reason buffer size affects performance, does not understand the transient nature of cpu overloads, apparently is ignorant that his plugins run differently when rendering for export, is apparently completely unaware of the importance of streaming performance in his particular setup, and is dead wrong when he says cpu speed is a minor factor in DAW performance for most people.