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There is nothing in the original post about changes in the amount of dust that is blowing around on Mars. I'm sure that varies quite a bit, as do the intensities of Martian windstorms.
The issue here is the changes in distribution of that dust from time to time. In this case, more dark surface has been revealed, which leads to some warming. At other times, the dust distribution causes the surface to be brighter, which leads to some cooling.
It is indeed a stretch to conclude that the uncovering of more dark material is anything more than a chance event, no matter how strong the winds happen to be.
Fred Bortz
Science and technology books for young readers (www.fredbortz.com)
and Science book reviews (www.scienceshelf.com)