He asked if the game will have certain fetishes or not. You didn't answer, which some developers refuse to answer these questions because they want to bait people into supporting them and then add in content like NTR/Sharing/Swinging later. So he, and many others, will want to know if you want to add that stuff or not before they try to play the game at all.
And as the developer it is a good idea to know what fetishes you are willing, or going, to have. For example, if someone asked if bestiality or scat would be added, you would probably be able to answer right away. The same ought to be true of NTR/Sharing/Swinging. Do you have plans to add that type of content into the game or not? It is a simple question.
And answering with a plain yes or no doesn't spoil anything. If the answer is yes then players who enjoy that would still not know how you plan to add it in or what characters it will be applied to. And if the answer is no, you could still have stakes and such, as there are lots of other things that could be used to build tension or suspense.
Edit: And if you don't know the answer yet, say that. You haven't decided. Though I would advice deciding quickly and not dragging it out, since again, many devs do this as a deceptive tactic to try to bait people into supporting the game before they add in those fetishes, which is what he meant when he said that bit about lying about content being against itch's TOS.