I think it's not uncommon experience for people to just assume they can't feel romantic attraction until realizing they can but it's just same sex. This theme has been done 10000 times in yuri manga but I think people are setting themselves up for confusion or disappointment because this specific manga used the terminology "asexual aromantic" specifically instead of just saying "I've never had any interest in romance" because that's a term that exists now. This is pretty clearly just going to be one of those types of yuri developments. It's not sporadic or bait it's just a common yuri (and well. Gay media in general) trope.