Well, I don't know if you can say it is in her past when she is referring to it in the present tense:
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I don't take that to mean it is just in the past. That being said, this game should still probably be tagged with sharing. And some people do have a problem with any potential LI not being a virgin or having had a sexual past, and that is a bit extreme, IMO, depending on how recent and whether that applies to the current story. I mean, how exactly can you have a good incest story without at least one of your LIs (Mom?/Aunt?) having a sexual history?
At any rate, the problem I can see is that if you don't care for sharing in the "present" story, or you don't care for a LI that is actively sexual with other men than the MC, the fact that you can't ignore and write off Olivia at all will qualify as an undesirable "forced" LI. That is another reason I think this should be tagged with sharing at this point. Someone who filters out sharing will not see this game and won't need to bother with it. Someone who looks for or doesn't mind sharing would be ok with the content, most likely.
It really comes down to the purpose of the tagging system. It should be a tool to aid in filtering searches and content. F95 has a very large and active content library and it is in both the Devs' and Users' interests, both, that the tagging and filtering system is as accurate and useful as possible. The updated tags need to get implemented and the search page needs to finally come out of its 'alpha' state and provide some improved tooling.