Yes it could. The boss seems to show strong tendencies of narcissism. Narcissists gather so called “flying monkeys” around them which fuel their sense of superiority and they bind them through various techniques to them (until they are also discarded). In this case the narcissist the PowerPoint-mockup people are these flying monkeys, feeding the narcissist all the grandiose ideas and it gives the narcissist a high for going towards that idea - similar how somebody just announcing they will do a hard task, e.g. stop smoking will make somebody feel good immediately before even reaching that goal.

Then, the people to whom the actual task of implementing it was left can’t deliver the grandiose perfectionist idea, and the narcissistic boss can and actually wants to fiercely abuse their power over them in order to feed on the high of superiority and control over them. It’s the perfect position for this kind of person, they can feel high all the time (eventually the tolerance will kick in and the boss must leave though but this can take some time).

Organization-wise it’s a bad boss really. It’s the job of the creatives to come up with great ideas, then the boss should moderate that working together with the feedback from the implementers. Instead the boss is due to personal weakness too suggestible against the creatives and puts the damage of his own making on to the team with bullying.