The before and after shots in the video sure are pretty convincing.
I had to laugh a couple of times though. What he should have said was:
1) It does a great job of removing moire, but on the other hand it also reduces the sharpness which improves the image more than the removal of the moire, and,
2) It introduces a slight colour shift, but here, I've radically overcompensated in post and made the WB much worse but in the other direction!
My vague recollection is that the Rawlite ones seem to be the ones that go bad, but here's how I see it. Either your filter is about to go bad, in which case you have enough problems and the last thing you need is to make your life worse by worrying about it, or your filter will be fine for a long time, in which case worrying will stop you from simply enjoying yourself.
🙂
So, either way....