Sure as hell has a lot of bearing when you have a raid series that goes out of its way at multiple points to give direct callbacks to recreate story beats from the original. In any case, it isn't headcanon - it is called basic media literacy. This is as blatant as it gets without outright saying it.
"Ah yes, this raid series is retelling a love story, but instead of a guy and a girl, they're now two girls. Never mind the fact that the original is a love story, we're showcasing the characters holding hands in literally the key artwork for the culmination patch, we recreate a scene specifically dedicated to the main character of the original being lost and finding their way through their lover caring, and we even go as far as to recreate subtle touches with the animation. We also placed a rainbow crystal in there, wonder what relevance that has in modern culture? Eh, must just be friends."
Never mind the fact that this game is no stranger to introducing queer characters. They're just not as in the limelight as this. There is an entire trope about very, very obviously lesbian couples being reduced to "just being friends" in media - and you are perpetuating it. It is genuinely tiring.