When were the original ones compromised?
Because being a candidate on the road all year and living in the White House are two very different scenarios?
Their original channels of communication might have been the Trump server communicating with the Alfa bank server which had been compromised.
The Seychelles meeting was held Jan 11th. One day after Buzzfeed leaked the Steele dossier that had circled around in various media/journalistic outlets.
So there was plenty to sync about.