I am not sure if laziness really exists. But there are countless reasons why someone can have this issue. Additional ones are: a physical lack of energy (nutrition deficit, sleep deficit, etc.), decision or option paralysis, problems handling emotions, trauma, .....

Idk, my parents and teachers were 100% sure it was laziness for years, they didn't seem confused about it at all. It wasn't until I was diagnosed as an adult in college that there was any confusion.