I suspect, but aren't certain, that it depends what time on the last login date that he actually logged in. If it was before the update, then I think he'll go bot on monday. If after, then the week after. The update is around 3am our time I think, and a lot of people log in after midnight but before 3am.
I had actually assumed he would go bot after the season ended so didn't even consider it a possibility he would go bot this season. Of course he could still come back but its looking unlikely.
I saw your other post but since I don't feel certain of the answer I'm replying here. I also have an interest in the answer to your question there, since if he is relegated I'm already promoted, as I have the second best record in the four D2s.