First of all, everybody has to tell the truth. The documents have to reflect the truth as well. I believe that is the case in this situation. As you said, $9 million is a substantial amount of money to Canadians.
However, keep in mind that, once the other residence has been sold, $7 million will be returned to Canadians. It's not just a matter of buying one residence and selling the other.
The people who deal with properties at Global Affairs Canada are the experts; I am not.