Some folks rush to opine, some rush to smear, some rush to offer conspiracy theories, but no one rushes to go back to what Paul actually said. I had watched the YouTube video before reading this post and what the OP reported is not quite what Paul said.
Go to the 56 second mark of the YouTube video and listen to what Paul actually said ... https://www.youtube.com/watch?v=BUGS2g4X4Ls&t=6s and judge for yourself.
The question being answered was on keeping your equipment on all the time or not. Paul offered technical explanations as to why to keep equipment on all the time for SS, but not so for tubes. No big surprise here. Paul went on further to say that this should not represent that big a deal for tube owners, since tube replacement goes with owning tube equipment and he replaces his tubes every year.
For all you know, Paul drives his equipment hard every year and needs to replace the tubes. It may have just been conversational or an off the cuff remark. Certainly did not come off as 'must follow' advice.
There you have it sports fans. It's so easy to verify things like this, before going off.
Rich