Ah, Zach is confused. What he is feeling, ordinary adults call "stress" and perhaps "shock", not "depersonalization". I understand, he is rarely stressed about anything because he has zero responsibilities and dumps literally everything on Mommy II: The Unclowned Cuckquean.
He describes "depersonalization" as feeling disconnected from your body/emotions and the world, reality feeling unreal, obsessive/repetitive thoughts, emotional/physical numbness, problems with cognition/planning, etc.
In my experience with sudden sharp stress, the shock meant that reality felt unreal, my body felt numb and distant, and my thoughts were both TOO clear and obsessive/repetitive. Time felt like it was going by unbearably slowly (he's recently complained of this). Everything else he complains about sounds a lot like what a normal college student would shrug and "oh, you know... midterms" over.
He's just so unused to anyone expecting literally anything of him that even the most minor task gives him the same symptoms of stress that normal people have when they jump out of an airplane. His distress tolerance is not exceptional for a 5th grader. But rather than admit that there is nothing especially interesting about his genetics and this is something he did to himself through abject sloth, he's thinking about reaching out to- presumably, I don't think Clown Mom seems disconnected with the world- his FATHER?
I'm going to bet that guy DOES have the same symptoms and problems. Because he's a fucking alcoholic.