Correct me if am wrong but I thought once they turn 2 then you don’t use a corrected age? Chewing is something they learn to do and don’t actually need teeth for it. Have you ever tried baby snacks like crisps etc? X
Check out solid starts on instagram for how to cut and serve food. I’d be going to ‘mouth mapping’ foods; a mango pit, chicken drumstick, spare ribs. Also try some messy play so get some yoghurts or mashed peas and let him just stick his hands in it and get messy!
Have you talked about putting him on reflux medicine?