I'm 60 years old, 6'1" and 220 pounds.
One of my first Dans is 6'6" and 310. He played lineman at his university.
What's that you were saying?
I think you will have a very difficult time finding a TKD school that doesn't teach the kicks and the variants at low levels. Something like a jump spinning back kick is really not difficult.
This fellow is a 1st Dan KKW. Not exactly what you'd call a higher rank.
No idea who this fellow is. But he doesn't seem to fit your profile either.
If you're talking about stuff like tornado kicks, then surely you know that those are more tricking than Martial Art. And that they're not a part of the curriculum required by any TKD organization I am familiar with.
It is a myth that TKD in any way requires students to perform those kicks. They're fun, practicing them can be good for balance and explosive power generation, and they look cool in demos. But you are rarely, of ever, going to see them used in anything serious.