Sure, to some extent, but that kinda just means that the entire homosexual experience is boiled down to a single tag. Sure, there are some people, like you say, who wouldn't use it. There are some that would, though. So, if it is of zero cost to some, and a potential positive to others, then it's still a good idea.
Leaving all that aside, though, there's also the fact that boy's love really doesn't fit as a descriptor for the specific story you're talking about. This is a story about how an adolescent boy reacts to the trauma of being raped. That's not exactly a scenario covered by boys' love, which is specifically about romantic homosexual relationships. Frankly, if I tagged that story as BL, it'd probably just lure some people in looking for a gay romance and getting, well, molestation.