Every non-aboriginal inhabitant of Australia is an immigrant.
Complete bullshit, as it seems you well understand:
Even the aboriginals are fairly recent arrivals if your perspective is wide enough.
I don't understand the racist hate.
No racist hate here, simply someone who thinks immigration should be controlled and targeted in the best interests of the country.
However, successive Australian Governments for a decade or more have been running record immigration rates - mostly under the guise of "skilled immigration" and associated hangers-on - with the twin primary objectives of suppressing wages and maintaining the property bubble. Simultaneously, they have been demonising the weakest and most helpless fleeing for their lives, who account for a rounding error in our immigrant intake.
Unsurprisingly, this systemic view of people as cogs in the machine to be used and discarded on demand has led to a similar culture amongst employers, most recently exposed by the exploitation and abuse of short-term holiday visa holders (usually "backpackers") by the farming industry.
As usual, the Greens have the right idea. Knock down the skilled immigrant intake substantially and increase the humanitarian intake. The footsoldiers of economic immigration can go somewhere else, we should only be importing the best and brightest through our skilled immigration plans, maximising the national interest, and using the rest of our "quota" to help as many people threatened by starvation, torture and death as possible.
When even the dodgy headline unemployment rates are running at 5%+ (real unemployment into the teens), the idea we need to be importing even more people to fight for fewer jobs is just flat out insulting - but the political right seem to believe they've reached the endgame and they're not even trying for a facade of propriety or governance in the national interest any more.