Sukuna does die in the manga. The way it happens is quite dramatic and ties in with many other elements of the story, adding depth and tension to the overall narrative.
Well, in the context of ABA, 'novel' could mean a fresh approach or an uncommon idea or method. It could suggest something that stands out or hasn't been seen before in that specific area.
No. Ryomen Sukuna is a fictional character from Japanese mythology and modern manga/anime. He doesn't have a basis in a true historical event or person.
Nope. Ryomen Sukuna has no basis in reality. It's a product of the creative minds of the writers and illustrators who designed a captivating fictional character for the enjoyment of the audience.
There are also stories where the communication between the ABA team and the family was poor. The family's concerns and insights about the child were ignored. For instance, the family noticed that the child was getting more aggressive after certain ABA techniques were used, but the ABA providers didn't listen and continued with the same approach, worsening the situation.