My brother, who is close to BL's age, is on the autism spectrum and has been in and out of psych wards since he was 12 or 13. This could be a reason why his parents were "expecting" something to happen - especially if he didn't have an official dx yet. I don't want to get too into my own story here, but a lot of autistic people including my brother have a variety of comorbid mental health conditions, but usually people have one issue (ASD, ADHD, anxiety, bipolar, etc) that "primarily" causes problems and can sometimes make other issues less obvious and less likely for individuals to get help. FWIW TikTok has been a huge contributor to a lot of "late" ASD diagnoses recently because people that are actually autistic have been discussing things like autistic burnout and masking that haven't really been commonly talked about on the more pathologized, clinical side of things. I think this is a very very telling piece of information because that's the type of term you don't just seek out on Pinterest unless it's something that is directly affecting you or a loved one.