Good result!
That's a lot of fluid! I think power flushing used a lot less last time mine was done but may be wrong.
The S80 Is changing it's own fluid today when fitting on oil cooler hose came loose probably from poor skills of whoever took it off to do the flushes on it......
Lucky I noticed the oil slick as she pulled out of the drive as while it had been leaking it got worse.
Many cable ties later and a decrease it's ok,it's going in for new hose and fluid,which isn't too funky so good thing.
From this experience I would suggest replacing that hose after finishing off the flush jobs. It's the top one with crappy plastic clip system. Maybe a nipple and hose clamps would be better!
The hose isn't cheap I would even consider having Pirtek put one in its place....