He would have to rewrite the whole story in that case, as either he would remain with his mom, than there is the sister story as well with that. Or introduce a new character as his Guardian. So probably more work than it is worth it for him. Or he is basing the character on someone and don't want to "defile" her. Only he knows.
My concern with the early rework is that part of it was due to having the events over a longer period to make it more realistic (as far as I know at least). But he now does the same, with 4-5 (longer) events per day, or the MC straight up sleeps through 1-2 days. So if he really does that, then newer players will be probably weirded out with the increase in scenes/day.
If he gets to complete the rework. Who knows.