Australian Rap is awful
The accent doesn't suit the genre at all.
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Also, just because someone clearly has a UK accent when they sing, doesn't mean they sign entirely with a UK accent. I mean they say "ae" isn't of "uh" etc. Paloma Faith, Amy, Adele etc. all kept their accents intact, but they still sing in an Americanised way.
Lily is pretty much the only one who refuses to use American annunciation. But in the first like line of "Rolling In The Deep" pretty much gives the example.
"There's ae Fire, Starting...."
When if she was using her actual accent it would be
"There's uh Fire, Starting...."
But yeah. Iggy knows what she's doing.