So I did send the message and they replied kinda like the reply you’ve got:
Thank you for reaching out regarding your interest in the ScanWatch. I am sorry to hear that it is not compatible with your mobile using Sailfish OS. I apologize for the inconvenience. My name is *** from Withings Customer Support and I will be assisting you today.
So I asked what they needed to release an app for Sailfish, let’s see what they’ll answer.