No, the change of address and/or city of destination, are irrelevant regarding your problem.
If he is asked and willingly lies about the fact that you are no longer together, he could be found to have misrepresented himself (as was mentioned in one of the earlier replies in this thread, by someone). This could lead to his PR being revoked, if he does land.
You have every right to blatantly lie to his mother, or anyone else except for CIC/CBSA, of course, while you stall for time to get an answer from CIC. You are the one that has the next 3 years of your life to be concerned about...financial, and otherwise.