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What's so hard about inverting a binary tree anyway? If Einstein lived today and was into computer science, he'd be able do this in his sleep.

True, but there are also brain-teaser type problems that don't require memorization of obscure algorithms, and those could actually be disguised intelligence tests. (But I suppose if you really wanted to you could memorize most of the brain-teaser problems in existence.)

Google has already shown that those types of questions have 0 correlation to developer success.

There are many things you can do with a whiteboard other than inverting binary trees. You're thinking too narrowly.

Obviously, but I was specifically referring to the typical algorithm oriented whiteboard questions found at major tech company interviews. Working a real world problem on a whiteboard I see no issue with.

This whole post is about companies that "don't whiteboard". Not companies that "only whiteboard for real world problems".