Welcome to the gastroenterology community! Has he seen a doctor about this?
Yes, but we've tried all his recommendations nothing is working
What recommendations did he have?
He may have a sensory disorder and cannot tolerate the texture of anything other than pureed food. If you haven't seen a specialist over this, now's the time!
maybe if you stop pureeing them he would eat whole foods, ist the way you have fed him that counts ..does he eat other foods okay .?
to add a little bit of chunks in his food and also to see a physical therapist.
Initially he thought he will come around with age.