I've seen a few people excuse "fingernails" as offside, which you also can't score with. That's just conspiracy though.
To be honest, I thought the rule was feet only being taken into offside. I wasn't aware that it was any part of your body prior to VAR. I never took a deep look into the rulebook, but that can be said about VAR in a lot of ways where we learn obscure rules no one was aware of.