Is Antarctica melting, or not?

NASA notes that one new paper states there has been less surface melting recently than in past years, and has been cited as “proof” that there

…Since the early 1990’s, European and Canadian satellites have been collecting radar data from West Antarctica. These radar data can reveal ice motion and, by the late 1990s, there was enough data for scientists to measure the annual motion of the Pine Island Glacier. Using radar information collected between 1992 and 1996, oceanographer Eric Rignot, based at NASA’s Jet Propulsion Laboratory, found that the Pine Island Glacier