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.
People down voting you for bringing up Kessler syndrome were correct to do so. It’s a complete non-issue for starlink-sized objects at that altitude.
Light pollution is a more reasonable objection, and the effects on the upper atmosphere of all those satellites burning up would be as well, but not Kessler syndrome