The difference is certainly worth knowing, but it doesn't affect the situation one bit for anyone who wants to watch those videos but can't.
It also has implications on the future of all other videos. If it's actually an intentional plan to take down free videos, then that means we can expect the people who made this decision on blender to continue their plan and take down other free videos. But if it's an algorithm mistake, we don't expect it to become more widespread, and hopefully the algorithm will be tweaked so that it will actually become less widespread.
This thread is about a company (500px) intentionally taking down free content for business purposes to make more money. Saying that youtube is doing the same thing is false.
It could also have been an intentional trial balloon, to test the waters to see how much they can get away with. Politicians do that kind of thing all the time.
I don't think we have enough information to say for certain what really happened.
https://www.blender.org/media-exposure/youtube-blocks-blende... has been updated. (and you are correct.)