@churlocker rather than going off topic in the other thread I’ll reply here instead:
I would love for that to be true but I really don’t think it was tested enough to claim that it failed. Did you use the same hardware? Did you see my follow-up to your test? Did you see @casual 's comment above about accurately printing E-reader strips?
I have no idea how gold stamps are applied to cards but I think accurately altering an existing card in any way would be a lot more challenging than accurately printing a high DPI scan.