We have an indication they aren’t — they make claims that are demonstrably untrue.
[edit] actually, the website is pretty clear about what they do and don’t do. It’s only the poster on here who’s overplaying the availability, OSS and privacy angles.
I don’t see a single thing that’s claims they are Open Sourced. Not sure how you or OP are coming to that conclusion.
They use open street maps and crowd source the traffic pattern just like the rest of the map apps.
Putting those together doesn’t mean they claimed to be open sourced.