If a blocked user will attempt to add a question, he will get a nothing-telling message, see screenshot:
I think help panel should not offer a way to write a message/do anything that leads to an edit if an user is blocked. I think the help panel should either be not displayed at all, or offer only the "self-help" section.
Originally reported in T222014#5147163, @kostajh told me to create a new task, so here it goes.