I don't think Firestone or Goodyear are in anyway involved in the reproduction tires. They sold licensing rights to Kelsey and Coker (& possibly others) to make them.
I believe John Kelsey uses the goodyear equipment at one of their facilities to mfg the tires from molds he typically has to re invent.
I wasn't aware he had that arrangement. Thanks for sharing that...
I like learning new things.