So if a tree is shaken by the wind, they attack it?

And if you stand still they avoid you as if you were a tree trunk?

Here's something to think about: A dog was chasing 2 kids to attack them, one fell to the ground and the other kept running. The dog kept chasing the running one and passing by the one that fell. He attacked and bit the kid that was running.

Dogs for example, have an instinct to hunt on things that run. Plenty of my friends have been bitten while running. I always start walking when I see a dog, and never been bitten.

Don't underestimate instincts in both humans and animals.

Yes, this is well known, but has nothing to do with whether they see you or not.

If it starts jumping around like a deer I’m sure they would at least investigate. They do have other senses too. Bears have been evolved to do a few things well over millions of years

Apparently, according to this story, when you stand still, they ignore you. If you smell funny, they may investigate.

If a tree moves, they will also investigate, maybe there is something to eat hiding inside. Bears typically live in forests, so there's not a lot of movement of trees on ground level. If a lot of trees move violently, they will go to their burrow to wait it out.