The information above is unfortunately untrue.
The Federal Government and the Provincial Government are both well aware of the nominees moving to different provinces, they even conducted a study on the retention rates of PNP nominees:
https://www.canada.ca/content/dam/ircc/documents/pdf/english/evaluation/e1-2015-pnp-en.pdf
Here's the help section from the IRCC website:
I am a new permanent resident in Canada. Can I live somewhere other than the “city of destination” on my Confirmation of Permanent Residence?
Yes, you can. As a permanent resident, you have the right to live, work or study anywhere in Canada.
However, if you became a permanent resident through the Provincial Nominee Program, the province that nominated you has chosen you to bring skills to their province.
It does not explicitly indicated that moving to a different province could result in misrepresentation or even revoking your PR status.
When it comes to misrepresentation, it will definitely bring up red flags when you have no intentions at all BEFORE you arrive in your province of destination. For example, if you buy a house in BC when you are a Manitoba PNP nominee before you validating your CoPR, the officers therefore will play the role of doing the final assessment of your intention when you are validating your CoPR at the port of entry or IRCC office. Once your CoPR is validated, the intention no longer applies to you as your PR status is protected by the Charter of Human Rights including your Mobility Rights. Thus, residing in your nominated province is merely depends on your morality.
Intentions change, life changes, and we cannot predict what will happen next. For PNP nominees, we should try our best to live in the nominated provinces before and after coming to the nominated province. But if life changes, we are able to move anywhere.
Here's the website that is helpful as well:
https://www.immigration.ca/provincial-immigrants-free-to-move-anywhere-in-canada
