I'm not surprised, the dev went in hoping to make easy money by using AI and copy & paste to make a basic game with only really 1 unique sex scene copied 39 times, and then drip feed updates and slowly increase the price up to $30-50 or whatever once it reached "completed" status
Then dlsite banished all the games that made heavy use of AI in their games to the AI category, effectively cutting off his international sales and (I think) removing it from front page
he got 28k sales and increased the price to 2,200 yen so he's already made a tidy profit from it anyways