Just for the record:
Poatan made his MMA debut in 2015, losing a thriller against a pretty good LHW. His ground game was notably raw but he had some decent defensive technique and used his strength well to initiate scrambles. He had two more MMA fights in a year, both of which he won against limited comp. He didn't fight MMA for another 4 years and looked like a monster on the international kickboxing scene, making several thousand dollars in the process.
I mention these facts because he has been training grappling for almost a decade now. He didn't just start in 2020, he's been doing this for quite some time, and it shows in his ability to defend himself on the ground. No, he is not an Oliveira or Ortega-level BJJ blackbelt and quite frankly I don't think he deserves a BB based off of what I've seen from him (or rather what I haven't seen) but Glover disagrees with me, for various reasons, and he's given him a black belt. So no, there's nothing the BJJ community can do about it.
Remember when Roger Gracie gave Rashad Evans a BJJ Black Belt? Yeah, the guy with like 30 UFC fights and literally zero sub attempts! It's not like this type of thing is unheard of.