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His accounts are back on Facebook properties, though. Previously they would display as a blank suspended page.

They never left. When he was banned, the accounts were left visible, but the ability to post to them was indefinitely restricted.

I don't use Facebook, but his Instagram definitely showed a blank "this user has been suspended" page before.

I don't know about Instagram, I don't really use it, but the FB page was definitely locked, not removed.