In uk.d-i-y John wrote:
Urgent! undermount stainless sink advice need!!!
My contractor is to install undermount stainless sink & granite counter
top tomorrow, but he told me that I will have to break the granite if I
decide to change the undermount sink later on, is this true or he does

Crap.
Neglecting everything else, it's only ~1.5mm stainless steel, and will
not stand up to a man with an angle grinder.