In my opinion, this is not correct. You can submit the PCC even after 6 months as long as date of issue of the PCC is less than 3 months from the date of your application (for PR).
But yes, if you know that your file was transferred (local or pilot), its best to mail them the pcc.
Hmm, not sure about that - interesting interpretation
Did you hear it from someone or is it just your understanding?
Though the problem with that is which date they now consider the 'application for PR' date. My father's online status shows up as 'we received your application for PR on December 25, 2007" (which is actually close to when I submitted my application to sponsor them.
The case transfer date does not seem to show up anywhere.
Before the current process people submitted PR application after the case was approved at stage 1, so the stage 2 submission date was more defined.