I can think of a couple of reasons to use the SR-71 again.

• Concern that a crash in space could lead to a cascade of crashes, disabling all sattellites.
• (On demand) capacity. I could imagine that the SR-71 can cover an unplanned spot faster than sattellites. Also, with the wars in Ukraine and Iran they're maybe finding out that they don't have enough imaging capacity.
• The imaging angle, a plane can image almost horizontally, they can look under bridges, through windows etc.
• A ten times increased resolution could be useful for recognizing details, maybe it's even good enough to recognize people though it might be pushing the limits of facial recognition. It's also the kind of resolution where they can read some text, e.g. identifyers on shipping containers or military vehicles.