You seem like a very relaxed person

This website is a lot more specific about the data used for fingerprinting.

It also lets you see whether two seperate visits can be correlated (or if your fingerprint is sufficiently randomized each time).

https://abrahamjuliot.github.io/creepjs/

Tl;dr: They use proper workflows for building the OS.

No Idea why they advertise this on their end-customer facing sites.

Source: https://universal-blue.org/