I had a 50 game streak going 11x1 winnable. I lost a game, so did the prior 16 people who tried it. 0 for 17. My winning streak was re-set to 0, but my Elo score did not decline due to the loss. Is this how it is supposed to work?
That particular game has an elo rating of 4896 - which means it's one of the few unwinnables of that variant. So no, your elo is not penalized for that impasse.
Also in case you weren't aware you're not playing the winnable mode, just regular 11x1. The game may have switched on you at some point.
It may just be terminology, but you are playing the regular 11x1, not the 11x1w. There are several dozen unwinnable games at level 10 in that variant.