First off, the guy's a dipshit because he uses Progressive as his insurance. But I suppose that's irrelevant.
In this court document, Toyota explains the system, and you can figure out how to opt out of the data issue. It's easy.
Me? I've got nothing to hide...
I think these are the drain holes. The largest are about 1/4" x 1/4". To be accessible by a mouse, they need to have a 5/8" hole, or a slot that's about 1/4". The vertical slots are .15".
As I said, they aren't going to get through that screen. How they got in with the link you've shown, is a mystery. I had the issue with my third-gen, and there was lots of room for a mouse to squeeze through.
I don't think this is a common problem with this Taco gen, or there would be other...