Wow! That’s very interesting. So silenced users are still very much part of the community… they are just forced to lurk. I’m surprised they can still like.
I do think it makes sense to be able to change their “about me” user profile, esp if the reason they were silenced is because their user profile looks spammy or has some other problem and a moderator has asked them to change it before they get unsilenced.
One thing I am recalling now is that we have the add rel nofollow to user content which I believe also covers user profiles. So you can put whatever spam likes you want in there but they will never be picked up by search engines.
