No, it even says on Lewdpatcher for Chapter 3. Incest was changed in Chapter 4, the game was reworked/rewritten to remove incest completely from the game.
Who knows if and when a new patch will replace it or update it? It depends on if anyone is interested enough to mess with Ocean's bullshit.
If you want to know why he removed said content, SS has in their TOS content with incest isn't allowed, they've never banned anyone over it, but that is the reason. Now why he decided to do on Steam to when Steam doesn't care about incest, rape, and blackmail, no clue...I have no clue how much of the player base played this game for incest vs NTR aspect or "both".