It's probably not that clear cut. The referred blog entry was written immediately after the elopcalypse in Feb 2011, after which the original non-free Qt licensing and development moved to Digia in March. Several other Qt developers have also left Nokia for Intel and other companies during the 1.5 years, and continue contributing to Qt.
So it's not clear with this data at least how large the actual Qt organization has been nowadays at Nokia. Since the Qt project (.org) launched last autumn, non-Nokia contributions have been constantly rising.