"Harem tag", per the definition, needs (a) courtship and (b) simultaneous sex of at least 3 to 1, none of which is given in this game.
I could be mistaken, I didn't get a straight answer, but for 'simultaneous', I do not believe it requires them to all be in the same room at the same time, but in the same general time frame. If you fuck someone on Monday, another on Tuesday, a 3rd on Wednesday, most people would count that as 'at the same time' when it comes to dating and/or sex, even if it is not a 'group event'. I mean, even in old school harems, you are not really expected to bang them all at once.
Well, we are up to several now, Amy, Sally, Mrs. Swallows (sort of), Claire, and depending on the time frame you want to count, Sarah (not really). Not to mention getting hand jobs, tit jobs, and blow jobs from others, and most people tend to count that as a sex act. With more to be added soon.
You also have rumors floating about with him and Sally, who knows/suspects he is doing things with other people, and who is sleeping with at least one other person herself, who generally prefers men
herself.
Personally, it fits my definition, but they can be funny about that sort of thing around here sometimes, so I can't say I know for certain.