the problem with ADHD is that you can think "it's quiet around here lately" but not recall the names of the people you haven't interacted with in a while.
they still exist in your brain as a whole person with all recognisable traits and interests, but that information is locked in the endless voidcupboard until some other associated memory unlocks it.
this happens with people I've regularly chatted with online for over a decade. it's like having a dictionary lookup where the key is a fuzzy hash of their display picture and the shape of the glyphs that spell out their name.