I'll answer your question with another question: is it Vegan to eat bacon made from a pig you personally raised up from birth after it dies naturally having lived a full life?
If you define Veganism as a diet, then bacon's bacon. If you define Veganism as a personal reaction to the cruelty of industrial farms, then perhaps this is how you get Vegan bacon. If you define Veganism as something more spiritual, then perhaps desecrating your dear friend's corpse by eating it is even worse.