I think the important point in the article is the selection of the time period over which comparisons are made. Selecting the past 30 years of temperature and ice records captures the warming trend that ended the cooling from 1940 through the late 1970s.
Is it possible that the 30 year satellite record coincidentally represents only one leg of a waveform? Greenland temperature records would hint at that. If you examine only one leg of a waveform, you will absolutely come to the wrong conclusion about the long term behaviour - just as some did during the 1970s ice age panic.