I think that's a stretch tbh, I mean based on what?
In his only boxing match against a 40 year old former 140 pounder, "da left hand" literally looked like a pea shooter.
Even if you ignore that, what has he done at 155 since joining the UFC? Beat Alvarez. The same Alvarez who was a completely shook manlet, looked like he didn't even want to be there, and went on to get demolished even easier in One FC.
I think the Nate, Floyd and Kebab fights are more accurate judges of his power at 155+. As in, it aint great. He has excellent reach and good accuracy, but he's not even close to being the explosive 1 punch puncher people make him out to be. Tbh it's fucking weird he still gets talked about like that, given what we've seen recently.