Thank you for the link, it is very interesting indeed...
I get your point about US residency, and not necessarily US citizenship, but I don't see any mention of residency either, like
@JayTheGreat mentioned...
But yes, I think you are right, I will just have to decide if the risk is worth it or not when my Australian visa expires... (my COPR expires next January, so for this I have time, renewal or not) It's just such a shame that we can't get any precise information from IRCC, nor any direct line of communication with them