Yes I did read the post and I will clarify: DO NOT TRUST THE DEVICE RNG. Never. But we are all very lucky, because we can mix entropy sources, bad with good, and it's enough that one of the sources is good. One of the systems I know of, uses SIX sources of entropy, hw based and two layers includi...

And about the tee/ree/tpm - keys are generated INSIDE THEM, never leave them, it's impossible to even assess the entropy quality in those. But thats just one of multiple problems with black crypto boxes.