There's nothing laughable about it, it's actually completely plausible. feck knows why you're being so derisive about it.
Yeah, for clarity, it's not an ethnic "majority", it's an ethnic minority. It might be a large minority, but it's never been more than a very small percentage of the population. But of course he would have been a Greek-Aussie. He'd have had two identities and been immersed in two cultures*. But apparently the guy above thinks it's "laughable" to suggest that he's been shaped more by the place he spent 50 years in rather than the other one.
*On that note, as someone who supported South Melbourne when I was younger, I really wish they'd stop acting like his coaching career started at Brisbane Roar. He won us two championships as coach ffs, and played there for years. This erasure of NSL history aggravates the feck out of me.