if a snake in the wild doesn't come across a mate with in a certain time frame it just doesn't mate that year, it doesn't go into organ failure, if that was true 90% of species that have to have sexual reproduction would of died off including humans. being that like most parents or owners or what ever he view's him self as tend to come up with an idea as to why their animal died and stick with it and typically fail to look any deeper at the animal, i doubt we or even he will ever know what killed or shortened the life span of his snake.
that said for some one who is in that emotional state to go and make statements as if proven fact should be nodded at and then just let the comments float on by. unless he has documented evidence to prove any of it there is no resion to give it a second thought. just let the man grieve and try to not grief him in his time of mourning.