yes part of it is because of itch killing off games with nsfw content but the creator has also said that she doesnt want the nsfw to be the focus of the game and minors kept disrespecting her boundaries which is why she is making it a seperate dlc they can't access so easily
there will be two versions the free version🆓 with all the original scenes from the game and a paid version💲 with all the bonus content every one asks for. the creator said she plans to give the paid version extra content like more nsfw art, more positions with ren and more scenes but since the dlcs will be separate she can focus on the main game first like she intended. and from what i see on tumblr she only planned to have a one or two nsfw scenes but lots of fans asked for more and now the game is not what she wants it to be since there is too much focus on the nsfw😭 so no it makes alot of sense for her to separate the nsfw and make the game the way she intended and especially since it's her passion project