Argo2:
I was intrigued by the high number of consumer IP's that these relay are supposed to be running on while seemingly automated updating the relay version. The nickname made me look into Ubuntu Snaps as a possible tor distribution which led me to this snap: https://snapcraft.io/tor-middle-relay.
we are well aware of the source of that package (see previous threads on this ML)
It was last updated the 9th of January and when you download the stable snap it is actually named 'snap269'. So the maintainer in this case is the snap maintainer, but not necessarily the relay(s) operator.
I was not trying to suggest that package maintainer and relays maintainer are the same entity (Chad, the snap maintainer is on this list)
I have not looked into how these snaps actually work but it may be the case that they actually needed the PortForwaring functionality to get tor running inside a snap.
Given that information it could very well be the case that these relays are not running behind a NAT
I doubt that. the demonstrated effect of removing the portforwarding functionality temporarily and their reverse DNS names suggest that they are mostly behind consumer grade Internet uplinks.