is this shopped

no, why would it be? some fans/media just asked them to do it for fun

He failed his drug test after his most recent fight, for marijuana.

Makes sense, he's always seemed like a pothead.

100%

So since he is registered and has the legal right do do it are they going to be less strict with him?

Doubt it. Nick Diaz has the legal right to do it since he has a card, but since he failed his drug test, just like Matt Riddle, he got a lengthy suspension. It's Matt Riddle's first offense, and it was Nick's second, so it wont be as long as Nick's -- but he'll be out for 6 months I'm sure.

Can they register before the fight like the people takin TRT can?

Yeah, but despite them having a legal card for it, it's still considered a "PED" so if you test positive for it, you get a suspension.

Well they have a lega card for it, why would they even go into the ufc ? you know they're going to use the benefits of the card..