This deconstructionist, wishy-washy, have your cake and eat it too BS, is just that, BS.Nice rant. But completely over the top. It doesn't define people as non genuine Australians, it just allows them to play for a heritage team if they want to. That doesn't stop them being genuine Australians - I think it's telling that you think one means the other. It doesn't.
Playing sport doesn't define if someone is or isn't Australian, that's plain silly.
It's really not zero sum as you're making out.
The other odd thing in your take on this is the terminology "genuine Australian", what on earth is that? Why do you get to decide what constitutes a genuine Australian? It's a nonsense term.
Do you truly believe that there're no social and psychological impacts on a person by constantly telling them that they're not an e.g. Australian because of their ancestral heritage, but are in fact something else?
Furthermore can you not see how they might interpret that as being told that they aren't, and never can be, a genuine Australian, even if it's just subconsciously?
Taking a kid that's born, raised, educated, speaks the language in the local dialect, etc, etc, and consistently insisting that they aren't a member of said cultural group, but are in fact something else, because of their ancestral blood ties to another ethnic or racial group that they have only vestigial connections to is f**king disgusting. It's just the same archaic ideas about racial lineage and cultural belonging (specifically imported American ideas) repackaged in a pretty new pseudointellectual packaging.
Take, e.g., Jarome Luai for example, he isn't a Samoan Australian, he's just an Australian, and until our societies accept that we will continue to suffer from pointless base level racial and ethnic tensions.
BTW, I love how you're literally pushing the f**king one-drop rule, yet I'm the one that's going on a 'rant' lol.