Doesn't seem to be, I can see LittleSnitch itself connecting to yoyo.org and obdev.at. GP may be referencing a past bug, either in LittleSnitch or macOS.

If it connects to yoyo.org, you have subscribed to Peter Lowe's blocklist and Little Snitch is trying to update the list from there.

I have, yes. Didn't bother to check the domains, just wanted to say they were visible.