CGDCT usually doeasn't go beyond subtext tho, so males not being relevant doesn't somehow make them lesbians. That's just the audience projecting.
But it's also deliberate. The producers know this. And more often than not they explicitly bait.
[insert rant about queer erasure here]
Well, it's Japan.
Either way you can see in series like Seifuku no Vampiress Lord (which fits, because hey, vampires) a male character can add. Even as a not-love interest. Or even an anti-love interest. Or whatever.
But the debate is pretty pointless without seeing the actual product; who knows what he actually means anyway ...