That's news to me.

It's possible I'm the last person on the planet to see this, but I happened upon what seems to be an early draft of the Supernatural pilot.

So early that the family's last name is Harrison instead of Winchester. And John's name is Jack. And we have the quote Kripke references in his commentary on the Pilot:

CUE MUSIC. And you can take your anemic alternative pop and
shove it up your ass. We’re playing Dean’s music--
adrenaline pumping METAL-- and we’re playing it loud.
The Impala. Pouncing down the I-5 like a panther. The
engine THUNDERS. The exhaust belches oily, black smoke.
Defiantly un-P.C.