This is entirely incorrect. It is true that your spouse can land, but will not be allowed to enter Canada as PR, since the primary applicant is not a PR yet.
Though this is written in detail in the processing manuals and the port of entry examination manual, in brief this is the IRCC response:
POE examination manual is available at
https://www.canada.ca/content/dam/ircc/migration/ircc/english/resources/manuals/enf/enf04-eng.pdf
Also, please be advised that call centre agents do not provide legal advice and many on the forum share info claiming to be have pseudo titles such as professional ATIPer etc. and peddling incorrect information.
When you have an issue, always rely on WRITTEN information available on IRCC website, or consult a LICENSED lawyer.