That's all irrelevant. Read what Del Prado said - the PA32 was not on his frequency when it had the accident. More importantly, when the PA32 left his frequency, he had no way of knowing about the helicopter and therefore was never in any position to pass a warning.
Aside from all that, controllers often spend as much time on the phone as they do speaking on the radio, it's a large part of the job. May I ask, if you aren't a journalist, (although you didn't actually deny it, maybe you'd care to now), what is your interest?