He was cancelled for calling Aboriginal people victims of settler-colonialism in Australia
Extremely unlikely. Australia’s colonial history and its impact on Indigenous Australians is a very common theme in modern Australian classical music and many concerts I have been to, including one just the other week, have conductors or soloists introduce the piece and specifically cite the context behind it. Unless the MSO is significantly different (which it doesn’t appear to be, based on some quick searches of Indigenous-themed concerts) this is not the reason. It was his comments about Israel targeting and killing journalists (what you quoted is not the actual introduction he made at the concert) which led to the cancellation.