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Managing moisture levels is probably the #1 way to control microbial activity.

You see the exact same idea in HVAC - if you can keep the relative humidity below 50%, mold growth becomes nearly impossible.

In laundry care, the dryer does all of the sanitizing action.

Etc.

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Why is it relative humidity that matters here instead of absolute humidity?

Relative humidity is an easier unit to work with because it auto scales with temperature.

I think GP knows that and it's exactly their point: why do you need slightly less water to stop mould growth as the temperature slightly drops? (If anything, one might expect the opposite anecdotally - it's e.g. hot and humid bathrooms that are particularly prone.)

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