Ouch, that's unfortunate! Thank you for looking into it for me anyway!
The formula I am using to get more usable values is:
That fixes the reported speed going down when the fans spin up and it gets the values to a more reasonable 3000-7000.
When the fans ramp up on my Zepherus G14 laptop, the reported rpm's in HWiNFO64 go down. I'm guessing it's similar to the fan speed issues with other ASUS ROG products.
It says my dbg file is too large to upload, but I uploaded it here: HWiNFO64.DBG