He has a list of possible idiopathic causes of neuropathy.

It seems to me that he is speaking more of Iodine when the neuropathy is a result of low thyroid. That's not the case for everyone. Looks like he has a list of possible reasons. Low thyroid being one, and treating it with Iodine supplementation a possible course of action.

It would be pretty dangerous for him to assume that everyone with idiopathic peripheral neuropathy having low iodine. Especially when you can be easily tested for low iodine. I wouldn't begin Iodine supplementation without talking to a endocrinologist.

I do agree with a lot of what he says. He also gives a timetable for nerve repair and speaks as if the condition isn't permanent. Which is very uplifting in theory but if the underlying cause is not found neuropathy is not going to go away, and even when the cause is found it usually merely be stopped from progression and not reversed.