Enquiring minds want to know.
He's not a well-known engineer.
He's a well-known actor/comedian that happens to have studied electrical engineering.
No true engineer could be famous. Therefore, anyone who is famous is not a true engineer, no matter how much engineering they did.
So you've heard of this engineer before? You must be one of those engineering types, not "just folks". Anybody who knows about an engineer doesn't count...
It's a clever argument but it doesn't say much.
"I say we take off; nuke the site from orbit. It's the only way to be sure." - Corporal Hicks, in "Aliens"