Once you got your PR, it's too late for the province to revoke your nomination. PR is federal, not provincial. Once we are PR, we are all equally PR. The only exception is when you have a conditional PR under a business program and must fulfil the criteria of that, running a business for x amount of time, investing y amount of money, creating z number of jobs etc.
A regular provincial nominee PR is not conditional like that. You sign a document stating that you intend to settle in the province. Intentions can change, especially if you are struggling in that province and get a better job elsewhere. Theoretically, if you never stayed a day in the province that nominated you, the PNP could maybe complain about you to CIC and claim that you had misrepresented yourself when signing that form and try to get your PR revoked but I have never heard of any PNP doing that.
