They're detained because China considers them an internal threat. The "war on terror" wasn't against Muslims in America: it was predominantly a justification for military intervention and for the creation of a domestic counter-insurgence apparatus (that will mostly likely be deployed against conservatives rather than Muslims).
That was literally 20 years ago. G.W. was an evil piece of shit that deserves the worst, but this doesn't really have anything to do with that.
They're detained because China considers them an internal threat. The "war on terror" wasn't against Muslims in America: it was predominantly a justification for military intervention and for the creation of a domestic counter-insurgence apparatus (that will mostly likely be deployed against conservatives rather than Muslims).