What the chapter says about P vs. J is most interesting, because that's what I've struggled to understand the most. I think if I were a J, my dreadful disorganisation and trouble planning things, and other inattentive symptoms, would have bothered me even when they weren't yet completely destroying every aspect my life and everything I dreamed for myself. Even when I wasn't desperate to change and trying my best.
Js are motivated to try to be organised by an internal desire for order/certainty, which is always there and always going to cause distress if not met. I as a P am motivated to try to be organised by likely external consequences of doing so or failing to, and they're not always there and so not always present to cause distress. Js with ADHD are going to suffer earlier on in the process and in more situations than the Ps with ADHD.
So it might take longer for a P with ADHD to come out of denial and acknowledge how little control they have over their tendencies, because some of the time they're genuinely not as bothered about order as most people are (most people being Js). It's frightening at first to consider the problem may be with you and therefore unlikely to change, rather than with the environmnent not suiting you and therefore likely temporary.