I wouldn’t doubt for a second that this guy said something else contrary to the Catholic Faith, but is it possible he is referring to someone who actually can not physically speak? If so, the Church must have some way of providing confession for them.
If someone comes to you it is because he doesn’t want to fall into these situations, but he doesn’t dare say it, he is afraid to say it and then not be able to do it. But if he cannot do it, ad impossibila nemo tenetur. And the Lord understands these things, the language of gestures. Have open arms, to understand what is inside that heart that cannot be said or said this way … somewhat because of shame … you understand me.