Well, nobody talks about "unhackable" platforms that never get hacked. And you can't prove a negative.

The xbone's weakest security lasted nearly double the product's market life, and that's several times longer than security on the 360 lasted, if you don't count DVD firmware attacks, (which was also several times longer than the OGXB security lasted)

Xbox security has gone from lasting months -> years -> decade+. On top of that, the later revisions with better security have not been cracked.