@gabriel it turns out that my state government had 3 pilot '20 minute city' programs in 2018. The nearest to me was the suburb of Croydon South, page 12 shows a map of "future opportunities". Things to note:
1. It's a government project not a market led project.
2. There are no proposals to ban cars from the suburb.
3. There are no proposals to make trains the only mode of transport.
I agree with @ned it seems like a marketing buzz word. I think I've given this topic enough attention.
https://www.planning.vic.gov.au/__data/assets/pdf_file/0023/653126/Croydon-South-Our-20-minute-neighbourhood.pdf
cc: @fu
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