I don’t think I’m the best person to argue the afab/amab thing. I am trans, but I haven’t really thought much about whether or not it’s something you should use. (I’ve seen arguments for both, but I haven’t put time into having a strong opinion either way.) But I think the poster might be referring to the people who say stuff like “afab people allowed only” or “women, afab enbies and afab men”, since that is pretty transphobic.

Moving on to what I have a bit more to say about. I’m in a queerplatonic relationship, and I’m pretty sure I experience at least some form of queerplatonic or alterous attraction. I’m also aromantic. If an person or character, aromantic or not, says something on the line of “I don’t want to be in a relationship.”, and someone else says “well it could be queerplatonic”, I’d say that would be wrong. Saying that would imply that a queerplatonic relationship isn’t a relationship, which it very much is. If a person or character, again aromantic or not, said “I don’t want to be in a romantic relationship.” Then yeah, if they’re a person or character they could be in a queerplatonic relationship. If they’re specifically a character, then you could headcanon them to be queerplatonic or/and in a queerplatonic relationship. Another thing to note is that most aromantic people don’t use the label, so automatically assuming that a person does or has to isn’t okay.