It appears their "AddOn" package contains an executable, supposedly for syncing. The addon's ToC also lists several savedvars that I'm guessing are uploaded by said executable. The ToC is marked for Cataslysm (4.3), yet some of the files have a modified timestamp as recent as Dec 27, 2019.
Here's a VirusTotal report on the executable.
https://www.virustotal.com/gui/file/...aeb6/detection
I'm still not running it or the "AddOn" for safety reasons.