So what, Jackson couldn't have possibly been one of the minority who needed TRT in their mid-30's?
Your follow up conclusion is flawed given the above point I just made.
I'm not a fighter and I've never taken steroids, but even I get blood work done which by default includes a panel on my testosterone levels.
You're using "loophole" wrong, because TRT was literally approved by commissions for fighters to keep their testosterone levels normal as they aged.
The loophole was fighters using the TRT exemption to abuse steroids and up their testosterones levels to prohibited amounts.
We don't have proof that Jackson used steroids when it was prohibited, nor do we have proof that Jackson raised his testosterone levels above the permitted amount when he received a TRT exemption, and trying to conclude otherwise based on assumption and leaps in logic is a flawed argument.