Is this an actual rule? It's on the website? Cuz when I applied, my visa also expired, but my study permit was still valid and is still valid...
There is no such rule. Such situations have not risen earlier. Earlier there were approvals ( I remember reading in this forum about applicant who went back to Nigeria ) .
This is new.
Apparently the facts in her case are still hazy .
In your case you still have a valid study permit, which she did not .
If there is a delay in your pgwp application and study permit expires then again you may fall in the above grey area as the facts become similar to her case . But as Bongoman says there is something missing about her application that is not available in this forum. Her facts could be different ( her mailing address ? or any thing else ) . Even a slight difference in facts change the whole scenario. So do not worry just now.
If you are in Canada you can continue with your implied status without any prejudice.
I am still new to this forum and therefore my views may be misplaced and open for corrections.