It's accurate. We've dealt with it a few times this summer, most recently last weekend. If you keep the radio on 16 they should broadcast as it's coming in, but I didn't hear anything last weekend.
If you're not out of the channel, any one of several authorities will pull up and "suggest" you move out. Back in July (July 4th weekend actually) we heard it broadcast on 16 while we were trying to leave the harbor, just past the airport. At 6kts under power, it was all we could do to make it past G5 and duck outside the channel next to Spectacle. A State Trooper actually pulled up asking where we were going - "out of the channel as fast as we can" - he said OK and went on his way. Nice guys actually, 2nd time they've approached us and have been friendly both times.
Thought it odd they'd schedule it on the Sat morning of July 4th.