i just read the thread on mokumokuren's bsky where they say they describe hikanatsu as a "youth horror" rather than a "romance" but still encourage everyone to make their own interpretations, all while assuring us that it is a queer story no matter the genre.
them labeling it as youth horror instead of romance is not an attempt to downplay the queer elements, but to specifically express an aspect of queerness that is often overlooked -- one that is all too familiar to aro/ace individuals. calling it a romance would simply give people the wrong idea of what to expect from the characters and story.
i don't think i've ever seen any author outside of fandom spaces explicitly try to portray this gray area of not-platonic-not-romantic queer love, and as an aroace queer person myself, it really means the world. usually this kind of "representation" comes from the typical yaois i ship -- "best friend" pairs who cross lines and are speculated by fans to be queer but are never confirmed in any way by the authors or story, leaving it open for this aroace-brand queer interpretation.
but here we are, being confirmed by the author that what yoshiki and ヒカル have is so unique and special that it can't be defined by human concepts of romance and sexuality, but is still undeniably queer. it's... revolutionary, honestly.