Well, that and/or the fact that there have been some accounts that are “generally assumed” to be him, without using his name. Hence the return of his official account is an “official” return, but not the actual return.

It’s still sleazy wording—note that I deliberately used the more accurate “return” instead of “welcome”—because it implies that X endorsed him (when in fact Elon said he disapproves of Fuentes), but that’s probably the other weasel justification one could use.