That's true and you are getting downvoted incorrectly. At first the interior minister wanted to move him to another equally well-paid position, but due to political backlash and also Maasen insisting there is a "radical left cabal" against him inside the government was retired early, which is still very much a golden parachute, but also the intended way for the government to remove political officials from office.
Retired to join law firm he was fighting while heading BfV. Clearly no conflict of interest there.