Bad news, the manufacturer is located in Switzerland and, as stated in the brochure, they advertise their product as “Made in EU”. Probably to implicate that any data which will be collected and processed will be under the terms of GDPR.
I haven’t looked up the terms regarding GDPR, but I assume that their data collection is somewhat “compliant” with GDPR, which does not necessaryly mean anything. It can just mean that data is not stored locally, albeit it will be send to the manufacturer (but probably entcrypted). However, under GDPR you can enforce your right of deletion of the collected data - that is, if you know that data about you has been collected.
What makes this issue so severe is that it would have never been detected that data has been collected and processed, if it weren’t for a malfunction.