Just noticed that Garmin Connect pointed me towards installing Garmin Express to replace the ant agent. Always willing to jump to the next thing I installed it...
As I was re-pairing my ANT transfer devices to the software I noted that my 910xt and 610 prompted for a Garmin Connect account to sync data to on transfer, but the Swim did not. I will quickly learn tomorrow if my swim will sync, and upload to Connect, but it looks doubtful. Am I missing something? I cannot see an obvious way to link it to connect at this point.