Clearly, it means more than "diddly squat" when accounting firms, financial planners, investment houses etc are warning their clients.
It's not about "worrying" but about preparing. there is a difference.
For a non resident for taxation purposes, I don't think so.
So, by your calculations, it's possible pensioners will lose $120 a week, yet, some people believe the proposed changes "are only for guys like Paul Hogan." Now, by your own calculations, it appears it's for everyone.
Yes, we all should have been paying non resident tax, even pensioners. It's not a new tax, just a new way to enforce that it's paid.
For someone who is not "worrying" about it until it comes in, why even bother doing the math?