I think what they were trying to say was that buying them off chain would be extremely unfavorable as the buyer gains zero of the protections that a blockchain claims to offer in this case.
And my original post wrote that bitcoin works in trusted environments, and maybe they didn't know that meant small networks of humans trusting each other with private keys off of the blockchain even though that was the only context possible, now they know so we’re just intentionally talking past each other at this point