I completely disagree with this statement, and I'll also point out that you don't have any factual data which directly supports it. Or at least, you haven't shown any such data, and I haven't seen it elsewhere.
There are a lot more than three things which matter to people. As I mentioned already, fetishes served in a game will have a large impact on the potential market share of the game. And there are a lot of fetishes which you didn't mention which will also bring in significant financial support. And there are other things, apart from fetishes and the gender of the MC, which also impact financial support. And one of those other things is how regularly the game updates. Another is how well the developer communicates with his or her supporters.
Actually, the term "loli" comes from the name "Lolita", as you already mentioned. The name became popularly associated with sexual attraction to underage girls in 1955, because of a novel with the name Lolita which was published that year. It's a novel about a middle aged man who marries a woman with a twelve year old daughter, and then he begins a sexual intrigue with the girl. The novel became popular and was made into a movie in 1962. Between the novel and the movie, the term "lolita" became a common term for sexually awakened young girls. But that happened between 1955 and 1962, before the 1970s.
