If I say "no auto-playing videos" then I mean No Auto-Playing Videos.

I don't expect you or my browser to start second guessing that with "oh, but probably it's OK on this site...?"

I do recall a Firefox discussion about how they can't 100% block videoes because there will always be another way - eg do animated gifs count, or javascript that shows a rapid sequence of images - but just because it can't be perfect doesn't mean it isn't worth doing.