Well, it doesn't qualify for a harem tag because most of the LIs don't know about each other yet, let alone approving of each other. On the other hand, there is at least one point in the game that strongly suggests a future harem of sorts
The person you quoted said it wasn't a single LI game, not that there weren't LIs. In fact, there are quite a few LIs and potential LIs. There aren't, however, any defined relationships with most of them yet.
It is quite an unusual game for this site, and it requires a LOT of reading (and the language for the first half to two-thirds of the game hasn't been proofread/edited yet.) It may very well not be for you. However, the story is interesting. The girls are attractive and multi-dimensional. PL does an exceptional job with the art and animations. I'd strongly suggest you give it a try for yourself rather than trying to read the tea leaves on this forum to make a decision.