Don't worry, the original subject became irrelevant by Saturday afternoon. And yes, they no longer do daylight savings time in Cozumel. The align with central time during the summer and eastern time during the winter.
We lost out on our bonus day of diving on Friday because of the port closure. I went and sat at the "closed" beach at Fiesta Americana most mornings from about 5:30-6:30 am (having young kids will do that to you) and on Friday morning the waves were crashing over the little sea wall. I was in no way surprise, or really disappointed for that matter, that the port was closed. I took most of my group into town for the day because they had never been to Cozumel and needed to see the real world, not just the resort. Everybody was pretty happy with the day.