Looks to mirror the overall pattern for extent loss. A faster period after 2000, and then a slower period in the last 5 or so years.
I think there is more to it that meets the ice. The first image is that of maximum volume and minimum volume. I would call to your attention that for 2017 the record max volume is very likely to be quite a bit lower than the record minimum. If that comes true that reinforces the downward trend.
I would agree with you that after 2007 something changed.
I took Max Volume - Min Volume as the volume lost in a year and Min Volume - Max Volume of the following year as the volume gained in a year. Those are the 2nd and 3rd charts.
I think the most interesting of those graphs is the volume gain, which shows a side effect of the phenomenon you and Tamino are pointing at. After 2007 the arctic started creating much more ice every year than before.
Here are the stats for the whole data set, for 1980-2006 and for 2007-2016
AvgVolGain 1980-2006 16.13581481
MedianVolGain 1980-2006 16.3
MaxVolGain 1980-2006 17.62
MinVolGain 1980-2006 14.709
Variance 1980-2006 0.519474464
AvgVolGain 2007-2016 17.8167
MedianVolGain 2007-2016 17.864
MaxVolGain 2007-2016 19.659
MinVolGain 2007-2016 14.872
Variance 2007-2016 1.704214678
Both the average and median after 2007 are higher than the max before 2007 with twice as much variance. Something certainly changed. The Arctic is making much more ice than before because there is a lot less old ice. That making of ice is what Tamino, the slow transition and others are pointing at as the savior of the ice.
But here is the thing. The more ice the arctic makes each year the higher temperatures become. The more ice the arctic makes the more fdd's go into making ice instead of showing up as a colder atmosphere. The inevitable result of higher temperatures is that less ice is made. Heat keeps being added to the system due to CO2, lower albedo for longer and changes in the atmospheric current that bring even more water into the system. This is likely to get worse before it gets better.
Which brings me back to Ding et al. Did they rule out whether causation goes the other way? Changes in the ice causes changes in the atmospheric circulations?