Here is the answer in Habermas’ own words.
“ . . . I am also a ‘compatibilit’ of sorts. The human mind, with its complimentary, interlocking epistemic perspective, is part of the universe of nature. Where I depart from the compatibilist mainstream, however, is in rejecting scientistic thesis that this universe is adequately characterized as the object domain of the established nomological sciences (on the model of contemporary physics).”
The text is a footnote to Habermas’ recent piece on free will.