
He had a trauma induced brain injury which resulted in amnesia AND loss of intelligence. It's 100% a real possibility & I have seen the effects of it myself in real life. Memory is not the only thing affected by brain injuries. The way your brain functions as a whole and processes information can also be affected.

I agree that they were much more focused on the amnesia part of it & that could make it confusing. My parents were in a really bad motorcycle accident 4 years ago. My mum came out pretty much unscathed but my dad almost lost his life and suffered a really bad brain injury from it. He doesn't have amnesia but now suffers from severe memory loss and the way he processes information now is completely different from before. He's not an idiot or anything but had a significant drop in his intelligence levels. It's an extremely painful thing to watch, especially when there's nothing you can do to help.

I’m so sorry for you, I hope that everything is okay now and that you all were able to adapt to this new thing! I hope you all stay safe, and I can’t imagine what you and you’re family had gone through! ;; but thank you for sharing that, and thank you for explaining it to me! I hope you have a good day!
So like, I get he lost his memories and all... but... people don’t really forget general knowledge of things. If he lost his memories, it’s should’ve only been like his memories memories, not things that he would learn. Hhhggg its hard to explain, but I’m pretty sure that’s not how memory works(and I’m saying this because this is like a more realistic setting?)
anyway, with things like short term memory and amnesia, you have 2 different types of memories. First is episodic memories and the next is semantic memories. Semantic memories are general facts and things you don’t forget easily and they’re usually things you learn in school or something, like the multiplication table and stuff like that. Episodic memories houses our personal memories and stuff like that. It’s episodic cause they’re easier to be forgotten and that’s also why sometimes we forget things that happened a month prior if nothing big has happened or our childhood when we grow up. From what I think I know, when you lose your memories or have short term memory loss, you forget your episodic memories and not your semantic memories, so his intelligence and knowledge of things like school and stuff should not have been forgotten.