i mean isnt his range ridiculously strong when he back raises a flop raise in a 3 bet pot multiway. He cant expect us to have JJ+ given its reasonable we are probably 3 betting those hands though not always. Also we are never raising TT here. So i mean it could be closer that we think but we do have a set in a 3 bet pot and folding could be terrible but im not too pumped to stack off.
If hes bluffing hes fucking insane imo.