Idk if I would classify them as having Munchausen. But what is clear is that Assa is narcissistic. And the thing about people like him, if they have a child and see dollar signs, they will exploit that child for profit. It's all about control, manipulation and how they can make people see this false image. This whole Fathering Autism channel was this narcs idea from the very start. He's always been the one controlling the situations and he even controls his family too. Narcissists are just horrible people in general, they do and say horrendous things, gaslight a person, they will pray on people, use and latch onto others to flue that supply they so desperately need. He knows what he does is wrong, and he might feel a tad bad for his actions, but at the end of the day, a narcist doesn't care.It almost a case of Munchausen... and gets attention and money from their daughter's condition. So they don't want her to grow. They want to keep her the way she is, or worse, so they can keep getting attention, recognition, etc.
Not much different than doing the opposite with Isaiah. His success is their success. They deserve that attention. It's not Isaiah's accomplishments but theirs for being awesome parents.
On the positive side, people seeing through his lies, questioning him constantly about what he's doing wrong, proving the lies, etc, it gets to him and if you push his buttons, that's when you see the cracks form In that false image he's so desperately trying to put on for people. It raddles people like this so to speak.