That's definitely what it says in that article. This article makes the same point:
http://www.eluniversal.com.mx/estado...a-1073452.html
It was decided to move ahead one hour during the five months that winter time is in effect, because in April, with the change to summer time, we will be the same as [most of the country]. In October, when summer time ends, Q.Roo will not set the clock back.
According to the article, the original proposal was to move ahead two hours. That didn't fly.