>The US have plenty of schools with armed guards and checkpoints, are they concentration camps?

No, because journalists and parents aren't intercepted by police officers when they get within a mile-radius. Even Guantanamo Bay operates with more transparency than the average "vocational center" in Xinjiang.

US prisons have classrooms too! But we don't pretend they are schools just because inmates can receive college degrees and job training.

You've identified one refugee that might have changed their story, ignoring hundreds of others, along with hundreds of pages of official chinese documents about the construction and operation of the facilities.