Agree with Helen that they may be being a bit less than obvious, but
it looks like exactly the same concept as cold casting*, which is
quite popular in sculpture as it means you can get the look of
metal, including using cold patinating methods, without having to
involve a casting company. It also opens up a number of metal
combinations which can not be achieved using traditional metals,
either due to chemical incompatibility when trying to bond them or
comparative hardness / tempering issues which would prevent them from
ever being workable even if you could laminate it.
Personally I like making the metal billets of mokume and creating my
own patterns, so not a product for me, but if used in the right
environment (no heat, low risk of scratching as it will be no harder
than a hard plastic) and appropriately disclosed to the buyer then
it seems like a nifty addition to one’s list of available ways to
solve thorny problems.