Decoy form on sign-up page

I just had a report from a user on #tor-dev explaining that they were having trouble requesting a gitlab account.

The user was trying to use this page: https://gitlab.torproject.org/users/sign_up

On the left hand side is some text explaining that one should go and use the Anon Ticket portal instead.

But, on the right hand side is a sign up form. This sign up form does not work: all usernames one types in the box result in an error "An error occurred while validating username" being displayed at the top of the page. (Browser dev tools shows my browser getting 401 on URLs like https://gitlab.torproject.org/users/Diziet/exists)

Presumably the intent is not for users to use the form on the RHS. Therefore, it should be suppressed somehow.