Dielectiric grease was discussed back in the Reo haydays and rejected by most Reo users. It's primary use is as a silicone based insulator that does not conduct electricity. Closest thing to it that I and many other Reo folks use on the Reos is TFE Paste to seal the feed tube threads when reinstalling it after having taken it apart for contact replacement/other maintenance to guarantee that it will be leak free.
I have no knowledge at all of Stabilant 22 and don't remember it ever being discussed back in the day. So I wouldn't be able to comment on it's use on Reo contacts without researching it. Since I don't try to fix what is not broke and am way more than satisfied with the DeoxIT products that I have used for many years on all my mods, atty's, batteries, I'll leave that research to you.