A doctor convicted in Matthew Perry’s ketamine death case made a stunning argument in a bid to shorten his prison sentence — claiming he was never really a physician to begin with. Dr. Salvador Plasencia is urging a federal appeals court to overturn his 30-month sentence, saying the judge unfairly punished him for abusing his role as a doctor when, in reality, he acted more like a ketamine supplier than a medical professional, according to court documents obtained by TMZ . Plasencia claims