That is not the original claim. At all. It's a goalpost movement of cosmic size.
If you want to use "cultural racism" go ahead.
People use those kind of words to mean things entirely disconnected with the original word all the time:
Alternative medicine: non scientific, not medicine
e-sports: competitive computer games, not sports
organic democracy: a dictatorship, not democracy
cultural racism: you do the math.
And Bart De Wever commented on Moroccan Berbers (specifically that they don't have an attitude of work seeking). Not on Muslims. Not religion.