Well I'm for Marmite rather than Vegemite of course. But I think I can spot a tongue in a cheek. Doesn't mean it's not a sincere tongue in cheek - what I mean is, whoever wrote the song is aware that he's putting on a bit of an act. I don't mean he's knocking the icons he mentions.

Can't see it as in any way jingoistic, in itself. A sentimental self-mocking bit of nostalgia I'd call it. A pity if it gets sung in a jingoistic context, but a song can't help the people who sing it.

But for modern Australian songs that noone could call jingoist or shallow Enda Kenny is the man! (And I betcha he'd put a different perspective on that song if he ever sung it! And I wouldn't put that past him either.)