For an emergency ascent, they'd probably have dropped more than two. They also probably wouldn't have taken the time to type a message to the surface if it were going wrong that quickly.
It seems more likely to me that they were controlling their rare of descent. I'd expect them to lose a little buoyancy as the vessel compresses, so it seems reasonable that they'd drop the occasional weight as they descend.
Then you'd be defeating the careful planning which went into making sure the satellites don't become a long term problem, by raising them out of the orbits which decay in just a few years and into orbits which never decay.