Sorry, I'm not going to name the high school magnet kid. You can believe me or not, I'm just putting it out there for OP's information.
However, what I've described is absolutely consistent with your understanding that such cases are almost non-existent. As I said, the TP magnet administrator made it very clear that our older kid's chances were virtually nil for entering in 7th grade. So probably other families in the same boat as us don't bother applying for 7th grade (like us). Or, they take the test and either do badly, or the kid ends up in perpetual wait list limbo with the other 100 wait list kids. Which is the same as not getting in.
Sorry for the bad news, OP. I was trying to be a little softer in my 17:52, but it's probably helpful to have it spelled out anyway.