What does "To commit suicide in Buffalo is redundant" mean?
It means that it's pointless.
Redundant means something that is so similar to something else that it isn't necessary in a description. It would be like saying, "the large, big house was huge." We don't need all those adjectives to understand that the house is big.
By saying committing suicide in Buffalo is redundant would be saying that living in Buffalo is redundant with committing suicide, so living in Buffalo is so bad that there is no point in killing yourself because it's already as bad as it can get.
I've never been to Buffalo, but I hope it isn't as bad as that!
Hope that helps!