Yes I've heard that and yes, I still think "Ebony & Ivory" is still cheesier.

(Of course I'll hold the controversial, shocking minority opinion that there's nothing technically wrong with "Frog Chorus"? It's just goofy, as with say "Uncle Albert," a track I once dismissed for being absolutely silly...but that's the point and part of the Macca charm, a lack of pretentiousness that we arguably got too much of in the early/mid-70s.)