I too have had 2.2 Motley Boas for at least 4 years as my oldest Motleys purchased from Jeremy. I have since produced my own that are 2 years of age and doing great. I have Motleys Het Albino form 2 years ago and some normals that are healthy as can be. I also had a beautiful Motley female breed at 18 months this year for me and dropped a perfect litter of motleys and super motleys at the young age of a little over 2. She has put all of her weight back on and is bigger than she was before she dropped. I will be posting a pic of her tomorrow.
So my opinion on your question, is that you have definately heard wrong. Motleys live alot longer than 2 years of age and thrive.
Hope this helps. Good luck to all.......Thanks