Fictive, "forced switching," and faking galore

I've known this human since they were 10yrs old(now 23yrs). I had temp custody and was privy to the therapy records from 16-18yrs because I was the human making sure they went to therapy. Multiple meetings discussing diagnosis and how to proceed at home to further assist the treatment plan and never was D.I.D even brought up. But the videos will tell you they were diagnosed with it before 8yrs old and forgot they were diagnosed. They are constantly aware they switched, majority of their "alters" are from various popular media, and they refuse to be called out by anyone who has been in their life. Featured here, we see Sal from SallyFace creepy pasta and Kid from SoulEater. They also have Venom(Marvel), Five(Umbrella Academy), Lucifer(from the Netflix series), and Ciel(Black Butler). What got me most about this video was the forced switching in front of the camera. Like even if I didn't know this person I'd still be beyond skeptical.