I find a lot (all) so-called "thinkers" are like that (not to use the term disparagingly) - you've got to adapt whatever their core idea was to the present context, using perhaps more enlightened accompanied thinking (eg. Like acknowledging the consciousness of nonhuman animals, as one example).

Or as Marx put it his doctoral thesis, when criticizing Hegel for his excessive flattery of the Prussian state (the latter's employer):

if a philosopher really has compromised, it is the job of his followers to use the inner core of his thought to illuminate his own superficial expressions of it