Looking at the EDSM data, I don't even see any ELWs with icy rings. Has one been reported somewhere?
If not, then I could still add them to the very last section, of stuff which might or might not exist.
AFAIK, there are no reports of ELWs with icy rings on Reddit or certain threads on here. So now that I think about it, these should move into the "maybe, maybe not" (aka. "Impossible?") section