If you want to design games for people who suffer from ADHD then by all means do so, the vast majority of game devs appear to be doing it already.
But to think a game dev should shorten their games due to this is simply absurd. The "lack of time" aspect is also simply an excuse. I played through Persona 3,4,5, and Royal all while having a family and running a company.
Did I do this in a single sitting? Absolutely not, it took a good amount of my very limited free time.
This is the 2nd article I've read about this specific topic, and all I can say to the writer is, don't play the game then... I personally love the length of these games, and I would appreciate it if people like you would stop trying to ruin it for those of us that appreciate a long game with a good story.