"the glaciers" How many? You have mentioned one that is growing but it is not among the three that are being monitored and are shrinking.

All they do is a sample. Is that sample representative?

Of ALL the glaciers, how many are shrinking, how many are static and how many are growing?

Even after that is determined you have to account for the different sizes of the glaciers to get an accurate measure.

Posted by Sawzall:
"Two hundred years [dating back before the CO2 buildup started] of glacial shrinkage in Alaska,"

Why were the glaciers in Alaska shrinking 200 years ago?