Excelent deduction Sherlock.
The characters in the game are not inspired by real people, or the dev could get into serious trouble for use of image, especially when the goal of the game is sexual in nature.
The realism of DAZ characters is sufficient for fantasy-based games, however, the use of AI is acceptable in these cases if you want to provide an "extra" realism that DAZ cannot provide.
Fortunately, in this game, the dev has taken care to present attractive characters from the beginning, which is why a pass through AI does not generate such a radical improvement, but rather provides an alternative appearance to what we see in the game.
I insist. This is your answer: provides an alternative appearance to what we see in the game
Look what happens in other game. On the left the game character we play. On the right the character passed through AI.
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Be glad, that in Milfylicious you have attractive characters with or without AI.