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Ashes will decide his career and he has a habit of giving such statements. He was also very vocal about Poms when there was some confusion on upcoming Ashes series due to covid quarantine . Dude was also calling for Ban on Afghanistan team when Taliban took over the power, guess after that Afghan captain also retaliated on his statement.
The best response was given by Ashwin in the 4th Test during India's tour of Australia when Tim was trolling him and the response from Ashwin was that his career will be over once he tours India

. The funny aspect is that Tim is vocal but not intimidating like the old Australian players who used to get under every touring players skin

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He did earn plenty of praise from all cricketing pundits when India toured them right after Sand paper scandal. Rightly so he led his team beautifully when there was a crisis, before him Aussie were known for their Pack of Wolves type of behavior. Countless encounters when they ganged up on opposition players, last incident was Warner-De Kock which ended with Sand paper scandal.
But he forgot that he needs to back his bantering behavior with performance and positive. No one raised the eyebrows when they lost first home series to India but Ashes series, particularly 1 match changed the tide and to make thing worse he also failed to win game against India at SCG from winning position, that's where problem started and then Gabba happened.