I'm pretty sure Nyx said that she is reworking simply because she's got better assets now and she's better at doing the rendering so she thinks she should make the earlier chapters look better as they were looking quite dated. She's never mentioned Steam, and as she's had so many issues with people reporting her to Patreon I doubt she'd try and go for Steam when that's usually worse for devs who try and push boundaries like she does.
Yup she was unhappy with how the early chapters looked, locations like the school, Melissa's backyard and pool and even the MC/Emily's house looked too basic, and she wanted to upgrade them.
The graphical remake is something she's doing on her own volition without external pressure.
In general the remake isn't supposed to alter the story, maybe add some extra details and context.
The exception to that is the past Iris relationship and adjustment of the age of the MC, this is something she wasn't really keen on doing, but decided to add to shut people up.
Let's see if it ends on Steam, great for her if it does, best of luck.
But if it doesn't... doesn't really change things for me.