he doesn't feed his snakes properly. a reptile is not like a mammal and there are not going to be significant health ramifications if an animal is congenitally underfed. the reptile is simply going to be tiny and grow at a much slower rate. you really want to take the position that virtually all of his snakes being 12-14 months old and weighing 150-250 grams is normal or ok?
Price: $550
Weight: 240g
Sex: male
Hatch-Date: 8/13/16
Morph: Bamboo
Price: $200
Weight: 172g
Sex: male
Hatch-Date: 8/31/16
Morph: Banana
Price: $200
Weight: 165g
Sex: male
Hatch-Date: 8/21/16
Morph: Banana
Price: $150
Weight: 95g ???????????
Sex: male
Hatch-Date: 1/12/17 ??????????????
Morph: Black Pastel Woma Pinstripe
Price: $225
Weight: 375g
Sex: male
Hatch-Date: 12/16/15
Morph: Emperor Pinstripe nearly 2 years old and 375 grams
Price: $200
Weight: 420g
Sex: male
Hatch-Date: 8/15/15
Morph: Fire Pinstripe Possible Orange Dream 26 months old 420 grams
that is just randomly clicking on snakes on the first page of his for sale. I didn't even have to look for egregious examples and I found some by randomly clicking 5 snakes. so yeah his snakes are undersized 100%. this is an exact mirroring of my experience with purchasing 2 of his snakes. it isn't genetics and it isn't poor feeding response. it's his feeding methodology. he doesn't care about the growth of snakes that he isn't holding back for a future project so he saves himself space and money by keeping them small, feeding them smaller prey items and doing it less often