i think the idea of "a relationship that transcends the label that is couple" (or just something along the lines of "our relationship can't be boxed in words") is a pretty common trope in GL, and fits right along with "i don't love you because you're a woman, i love you for the person you are" (that literally showed up a few chapters earlier lmao) which is a trope with some nice pan undertones too. so in that case i would argue queerplatonic relationships are actually all over the place.
imo, it's mostly just a writer's way of making characters be gay without ever calling them gay, but if you interpret it that way, yeah i think that could be an awesome way the series could head in