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To be clear the 0.89% figure was obtained by dividing hospitalizations by population, so it includes many unvaccinated people who have not caught COVID (yet).

The chance that an unvaccinated person who is COVID-positive will require hospitalization is around 3%.

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What’s the risk for non-obese people? Not that obese people should be considered less healthy, just curious because much of America, outside of San Francisco, is obese.

But they are obviously less healthy?

Obese people are less healthy, that's a fact.

Are these numbers for the US?

Yes. You can do a quick and dirty estimate working backwards from the article's own figure of 2.6 million COVID hospitalizations in the US. If you very generously assume 1/3 of Americans have been infected, you get a hospitalization rate of 2.3%. If you assume the vaccines prevent hospitalizations, then the risk to the unvaccinated must be higher.

I wouldn't call 1/3 "generous". https://covidestim.org/ has some estimates of the fraction of people ever infected by US state. I can't seem to find an US aggregate figure, but by clicking on a few random states they all seem to be at least 50%. California (the most populous state) is around 60% even before omicron.

Your estimate is likely off by a factor of two.

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