I don't want cis people calling themselves trans. That is harmful and threatening, especially if they want into trans safe spaces. Gender non-conforming and genderfluid don't always mean trans. That's why I'm glad that person admitted to being cis rather than trans. I think it's important that cis people question gender norms without necessarily identifying as trans.

This is mostly hypothetical as I am not the person in question and have no idea how they connect to their labels. Just guessing around.