These tyres are clearly being offered to the "as delivered by Ford to first owner" concourse guys who are chasing the most original parts possible.
Maybe the more modern tyres are safer, and do handle better. However there is a rapidly growing demand for these cars to be restored to as close to original as possible, warts and all, and no improvements/modifications.
This also includes how the car would have "felt" and handle and steer on the road in the era when it was brand new.
As more cars are restored and displayed at shows, inevitably the competition and quality is forced to increase and so is the level of judging.
Amongst other things, original tyres, or as close as possible, always excites me that the owner has gone to that extra effort by being mechanically, and technically, and date correct.
Congratulations to those who are making these tyres available, regardless of the cost.