I believe you're the only one recently calling it a porn game, soft-core, hard-core or otherwise. So in terms of proving things, all you managed to do is to prove it's not something no-one else is claiming it to be.
This is L&P's own description from Patreon "I’m trying to fuse art and eroticism, combined with a slowly developing story full of lust and passion, to create an aesthetic, realistic adult game", which is why some of us refer to it as an erotic novel, as opposed to the porn game others think it is.
And as for incest, how can this be considered an incest game when the sex scenes are with the husband? That during the Ellie/Julia scene, Jules gets further than Ellie precisely because they're not related? And that the other major character on the straight route is Sam, also not related to Sophia, yet the second highest male in the favourite character poll? Yes the game will have incest, but it also has non-incest content too.