Too much evidence for that, thanks to how many almost complete t. rex skeletons we have + the fact that almost all giant carnivorous dinosaurs had tiny arms. However, there's a non-zero chance they were fluffy in at least some places, and a high chance they were incredibly fluffy as chicks, given how fluffy one of their close relatives is known to be.
So my takeaway from this is that if I had an enormous tail implanted for counterbalance, I could also have my arms shortened in an act of extreme body modification.
(But seriously, that was super interesting. Thanks for posting.)