This is inaccurate assumption. Even if this user got unbanned, it's likely he'll get signature ban for 1-2 years. Within that time, signature campaign condition may be changed for better/worse and he need to make some activity if he wants accepted easier after signature ban period ended.
I do think it is accurate. Why is he likely to get a signature ban? The last two cases that I remember were those of Mpamaegbu and Pokapoka124. In the first case it was a single plagiarism some time ago, so it doesn't have much to do with this case, but he didn't get a signature ban. In Pokapoka's case it was plagiarism several times, so more similar to this one, and he did not receive a signature ban.
If I remember correctly, in both cases there was talk of signature ban.
IIRC signature ban is somehow common when admin/moderator decide to remove permanent ban, although i no longer remember which member who got such treatment.