It's entirely plausible. Moscosa's job was to travel around finding out what juniors were up to. He said he was tied up till after 20 November.
Probably no appointment was ever made. And a little over a month isn't enough time to get a $600 million deal signed. Board approval would be required, and prior to that Moscosa would have needed a great deal more information. He would have had a number of exchanges with his employers.
A CA is demanded by the party being visited. In this case SRGE. SRGE can demand a CA be signed before Kinross even shows up or before it is exposed that SRGE it is a fraud. It makes perfect sense to do so. A CA binds Kinross from exposing what they learned - good or BAD.
The CA is not dated but my bet is that the CA was signed before Martin and the Ghost Michael (aka alex) even met. kinross certainly put their cards on the table when they PR'd that no deal would ever take place.