No, it's a myth - actually they scoffed and complained very loudly recently when they were picking a destination for a school trip, and the teacher suggested they would use ChatGPT "quickly" to compare their suggestions. Also anyone who thinks the kids could survive school assignments based on ChatGPT...clearly does not know who schools work these days...
Our experiences differ, it's no myth over here.
Interesting anecdote, that's been almost the complete opposite of my experience in Higher Ed.
I probably know more people using AI to cheese all of their school assignments than those that are fully 'clean'.