[foxyv]

Essentially, the atmosphere contracted due to the solar minimum and they want to make sure inoperative satellites decay within months rather than years. Ballistic decay is a safety mechanism in case their satellites break down. Also they will use less fuel for avoiding the crowded 550km band.

> "As solar mininum approaches, atmospheric density decreases, which means the ballistic decay time at any given altitude increases — lowering will mean a >80% reduction in ballistic decay time in solar minimum, or 4+ years reduced to a few months," Nicolls wrote in his X post. "Correspondingly, the number of debris objects and planned satellite constellations is significantly lower below 500 km, reducing the aggregate likelihood of collision."