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You're inverting cause and effect.

The reason it gets so hot in cities is because it's a concrete wasteland that traps heat because of, guess what, cars.

Here's an experiment to show said effect - same city, same day, very different street layouts: https://doemee.leiden.nl/uploads/55aa69e8-fb15-4ccc-8335-9b6...

San Francisco is not like that though. that's the whole point of the article. They could also take transit.

SF despite being dense and having high transit ridership for a US city is still fairly car oriented. If the endpoints of your trip are not near Muni/BART station it's going to take twice as long on transit. And the hills can make the walking part difficult for people who are elderly, disabled, or need to transport items.

That sounds like a place not suitable for human life.

Well, hundreds of millions of people already live here.

Not for much longer. In the 20 - 30 years, those areas will become uninhabitable.