As far as this one goes, I think this is more typical of Joe Biden. Like his "Don't jump!", he's probably used this tired old line at about 30,000 dinners where he had no idea who the "chef" was, or even cared.
Don't pin this one on the writer. It's just another example of Joe thinking he's being clever.
I have thought Biden was a slimy fool ever since I saw his performance at the Clarence Thomas confirmation hearings.