The KBC void argument is worth including in any review here too - some researchers think we might actually be inside a supervoid ourselves, which would affect our Hubble constant measurements. It's all connected.
I talk about it constantly and nobody in my life is willing to engage. Thank you for this.
The standard explanation is that it's just a statistical fluctuation in large-scale structure, the universe is lumpy and sometimes you get big empty patches. But 330 million light years is very large for a fluctuation. The expected size from lambda-CDM models is smaller. That gap deserves more attention.