There is no great surprise here. For a start, this information has been "on the table" for over 5 years now. this is just a detailed re-work of some of the finer points, with new pictures and analysis.

Secondly, it has long been known through orbital theory that Mars' spin-axis inclination is unstable and the planet fluctuates between near zero and up to 60 degrees.

Climate studies show that at extremely high inclinations, it is the equator which is colder than the poles, and hence the polecaps will migrate and develop at least a partial equatorial ice belt.

However, NONE of this involves liquid water. The vapour-snow-ice cycle is amply fast enough to move all that ice back and forth in the required timescale.

Sure, Mars is dynamic. But it is cold, arid, and dynamic. This doesn't change the odds for life on Mars, imho...