Not sure what's going on with Trump Jr. He was set to do a speaking tour of Australia, but that's been delayed and/or possibly cancelled
Home affairs minister says that despite Trump Jr’s promoter’s claims, the US businessman was not ‘cancelled’ and had been granted a visa
www.theguardian.com
They're blaming the visa turning up late, but from the article, he only applied for it two weeks ago, which is about right for the usual turnaround on visas. Trump Jr himself is blaming the usual Republican fictional bugbear, cancel culture. There
was a petition to deny him a visa, but it's not like they didn't sell loads of tickets for the event.