It's unclear to me how improving one's ability to pick out satellite reentry events from weather radar data either "mitigates the risk of orbital debris" or (as the article's title claims) "saves billions". Satellites (and space debris) large enough to show up on these radars are certainly large enough to be regularly tracked by the US SSN (https://en.wikipedia.org/wiki/United_States_Space_Surveillan...) (which also provides reentry predictions and estimates), so this is largely a correlation exercise.

It's interesting work (IMO), but the post isn't clear about how the work fits in to the broader space situational awareness/space traffic management ecosystem.