Looks like they are referring to this:
https://www.mobileread.com/forums/sho...d.php?t=162713
The solution is to edit your hosts file so GA is blacklisted. This requires root of course.
[edit]: I just checked mine and whatever ad blocking program I had installed had already blocked two of the three addresses so I manually added the third. Normally I don't care about being tracked by GA but that's at the website level. I don't think it's right that kobo is using this to track "in device" actions.