It’s not uncommon to be listed as a notable alumnus of a college if you become a famous person. But this man doesn’t think this is right. He thinks he’s undeserving and takes a jab at Wikipedia for the unreliable crowd-sourced information. Great, let’s blame Wikipedia for your popularity.
Many writers are famous for their works, and John Moe is one of such writers. So, it’s not out of place for his college to recognize him as a notable alumnus. That’s a subtle way of telling people that he was recognized and celebrated for his success. The jab at Wikipedia was just a diversion for him to brag.