Can a user request suspension? (I'm coming from this user's profile)

(of his own account)

I vaguely recall that there were some similar request in the past and I think there was at least one user suspended by their own request.

You can check this post and links given in the comments: Is it possible to temporarily disable my account on MSE?

Possibly other users might be able to find other similar posts or recall other instances when this happened.