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In the FAQ they say they heat the frame to a temperature which "harms the varroa but does not harm the brood". IANABK, but color me skeptical.

That sounded dodgy to me but it does look like it's got some legitimacy: https://scientificbeekeeping.com/a-test-of-thermal-treatment...

I mostly use oxalic acid, but if heat treating becomes viable I'd welcome it on the hobbyist scale.