took a quick look at their website, mostly same layout (even with that radio widget thingy). there's also few locked/paid chapters already uploaded.... yeah it's definitely them rebranded, rather than someone else taking inspiration or pretending.
while otome game can be abbreviated as otoge, that term usually refers to music/rhythm game first. even a quick オトゲー or おとゲー search will return them first.
although, I can see that if you search "otoge" it will return otome game, which I assume due to lack of people outside japan using it for...