If this snake is 2 years old (meaning 24 months) then yes, this snake is underfed. Underfeeding a neonate is not healthy. Once the snake is larger (say 400 grams) one can cut back on feeding. I personally would not buy a 220 gram 24 month old ball python.
I'm no vet, but if this snake doesn't grow, it will be stunted, including it's organs. Don't go hating on me, this is just my opinion, I have no facts, but if a snake isn't allowed to grow, how would you expect it's organs to be healthy?
This does not pertain to lets say a late 09 where someone COULD call it a 2 year old.
Jim Smith