Indeed butted and brazed steel frames can be very pretty (though 531 can also be welded).You would be surprised at how many motorbikes had brazed frames, I believe Reynolds 531 was always brazed
Need maybe @Turktowner to confirm.
J
Original Choppers were mostly brazed, the new ones are all welded I think.
So, if the frame in the teevee show was an early model, brazing would have been appropriate. You'd need to be careful welding near a brazed joint, welding temps can exceed the melting point of brass.
Course the arrival of carbon fibre, loonium and other exotics caused Reynolds some troubles, but they're still around. Steel frames are 'steel' (ahem) the choice of the connoisseur..