This assumes executive dysfunction only ever comes from lack of (available) dopamine though.
It's better advice than stressing yourself out, sure, but it may just be useless.
The only thing that has ever worked for me - and I have tried giving myself treats before and during a task - are hard, immovable deadlines.

They were a bit too absolute-y in my opinion.
But yeah, there's no harm in trying to see whether it will work for you.