Yea but that was a person who actually put in work and had to think about and understand the problem. They didn't just generate something with a magic box.
It doesn't matter who found the error nor how it was found. An error is an error.
Now here there was no fraud just genuine error, but it will annoy people nonetheless and scrape their ego that someone uninitiated can just type some stuff in a magic box and conclude that they, the established published, tenured mathematician with awards and medals can be wrong.