You are taking the word "playerbase" to mean "worldwide distribution of people who play games" instead of what he actually meant which is "the people already playing this game".
This game has been running for 4 years and 8 months straight.
Its existing players (aka, playerbase) are those who like male MC, with harem, and incest.
Look up selection bias
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Will some gays be lured in to become
new players? sure. But that is not the game's current playerbase but a hypothetical future playerbase.
The question is, would it be more new gays coming in then straight players pushed out?
For a gay player, what is even here? a heterosexual game with hundreds of heterosexual scenes and literally 1 single token gay scene.
Vast majority of gays will not come over for this. Many probably already have this game on their ignore list because it is a straight harem game.
Realistically I expect exactly zero gays to be lured in by such meager offerings.
Instead what will happen is that a small percentage of players will enjoy the scene, but most won't. And an unknown number will cancel their subscription
