I'll trust them when I can inspect their source code and chip schematics.
I think it's more a case of the HN crowd trusts Apple way more than Meta.
Meta has ~3.5 billion users while Apple has ~2.5 billion users and Meta is one of their top app developers, which suggests people trust both of these companies way more than they should.
You trust Meta to do this unfailingly, without making an exception for themselves which you will consent to somwhere in a 30 page user agreement or a dark pattern in the UI?
That goes against the very soul of their being as demonstrated by everything they've done to date.
Seriously, trust Meta to do anything privacy preserving? Besides that, they also record audio.