I'm not questioning the power, but a beast of that magnitude must have a pretty durable body.
There's some sort of radical breaking of physics going on with Tao. He has surpassed some sort of barrier where he's no longer a normal type of person.
Mega Rex is just a big dinosaur. There might be some huge diminishing returns on pure size alone.
Tao breaks the barrier. Mega Rex is huge, but he's flesh and bone. I haven't dug too deep into it, but Tao throws that pillar at like Mach 8.
If Tao throws a rock at Mega Rex at that speed, bro is getting completely obliterated.