The basics in RPGM aren't very difficult. I watched some youtube videos and played around with it well enough to have some cool events and fights. It's actually quite fun imo to work with RPGM. I also think his project must be super confusing due to both the story and the features he tried to include. It's most likely too overwhelming for someone else to take over.
I don't think he had enough of a story to kick off with honestly. He chose a television station as his new setting and had the character move there to distance herself from the craziness from the first game, but he apparently had no plans beyond the weather report and possibly an interview to do at the television station. There's a vast variety of situations you could do with that setting, but instead of capitalizing on that he starts announcing bouncing back into a school setting for some undercover student thing.
His weather system is pretty neat, but it's not the most needed part. You could have easily worked around it. I have heard of others adding scenarios to old games using RPG Maker, so there's no way you couldn't just leave his stuff there and create new triggers for scenarios.
Just to throw it all on the table, there are far too many people doing games or doing stories in general that don't think about their endgame. They only think about the start of an adventure and the setting. You need to have a point to work toward. Rnest had that with his first game, but he didn't have it here. He tried to give her a new start with no goal for her to accomplish. He just threw her into this new career with only passing thoughts about it.
He should've started by having her move to the new area, not by trying to explain it through a very short flashback. She could have applied at the station, met her neighbors, and worked as an assistant for hours of gameplay while he figured out how his weather system would work and any other systems he wanted to attempt. That starting point would be the foundation he could build from and if something didn't work he could return to that point.
Instead of that it seems like he's drawing with ink instead of a pencil, not saving his earlier work so if a line goes wrong he can't erase to fix it.
That all being said, I might give it a go and just take inspiration. Try my hand learning RPG Maker again.
