That's a more than weird statement.

Especially considering your location (and presumed nationality)

It is the Canadian regime that captures anyone their US puppet masters demands on crazy fishy reasons no sane gouvernment would act upon when flying via a Canadian airport (and actually stay airside at doing such)

Flying through China, especially when staying airside (and unless you're an escaped prisoner or something like that) doesn't bear any risk to any normal traveller.

So I'd suggest to bring either hard facts, if you claim so, or not to keep irritating travellers with your stories.