That's a bullshit take. We had an Australian go there and hire everyone. If it were Australians he hired out the blue (i.e. with just that little trust), he would have heard about the problem as soon as they were discovered.
There has to be an understanding that you won't be penalized for saying it's not the right thing. Which might be obvious in your company culture but not really obvious even for different companies much less broader cultural differences.
Guessing those Australians would have had much better labour protections and a better social safety net if they did get fired, giving them the safety to criticise. Not "trust" exactly since it's more about not needing to trust a given employer, but a similar pattern.
What's a more guaranteed way to get fired: report an issue with a task upfront or keep doing useless work for a couple of months until the boss finds out?