Why would Eggman name himself after a disease that never existed in the first place? Gerald Robotnik has a mustache, but does that mean he has “Eggmanpox”?
But how is 50% of biological life wiped out by a disease that doesn’t exist, that you say was only spread by Eggman, when Gerald Robotnik has a similar mustache and was on Earth WAY before Eggman was born?
Gerald had Geraldpox whose contact with Eggmans inbred genes caused it to mutate into Eggmanpox and that Eggmanpox killed half of all life and turned the other half inbred.