The fact that tidewater glaciers march to their own drummer is well known among glaciologists. That was a common topic when I studied the subject in the 1990s. I was hearing about those glaciers from the same scientists who were worried about the retreat of many other glaciers. As your quote states, the position of the terminus of these tide water glaciers is determined by the submarine moraine, not the climate. As long as the glacier can push this moraine forward it will advance; once the water gets too deep, the glacier starts calving rapidly, and retreats like the nearby Columbia glacier. Glacier Bay is another example of a tidewater glacier in retreat.
No one is hiding or suppressing knowledge of this kind phenomena. A glaciologist is just as happy studying an advancing glacier as a retreating one. A climatologist would be just as happy studying a cooling climate as a warming one. Arctic people still have to deal with climate changes (changing sea ice seasons, changing animal migrations, thawing permafrost), regardless of whether humans are to blame or not. People who depend on melting glaciers for mid summer water are still worried about the disappearance of those particular glaciers.
Here's a discussion on a scientific survey of glaciers around the world
http://www.realclimate.org/index.php?p=129
There is a more recent comment focusing on tropical glaciers.
paulj