No... from the article "The commissioner’s office then confronted the Red Sox, who admitted that their trainers had received signals from video replay personnel and then relayed that information to some players — an operation that had been in place for at least several weeks."
The video replay personnel are sending messages, via Apple watch to the trainers.
I don’t think the camera room were relaying the signs, but rather what the signs meant. So that when a base runner was at 2nd they’d understand the signs they were seeing.
The most effective (and hard to spot) way IMO would be some sort of custom app that would do different wrist tap patterns. The players on the field wouldn't need to look at the watch at all.
Maybe it was: if I touch my Apple watch it's a slider, if I touch my Android watch it's a fast ball. The article seemed fairly confident they were using the Apple watch for something.
