Never have I seen a more clear example of autism on a manga.
But as always, I bet the author has no idea they wrote a character as autistic.
Mental health education is terrible in Japan, so it is not uncommon for them to not even be aware of mental health issues the rest of the world can identify on sight.
As an autist myself, I would NOT like to live in Japan where even saying you have mental health issues would get you shunned.
(Insert "lol bro you dumb it's just a manga" comment here)