PiS rhetorically is anti-German and coins every opportunity it can to appear anti-German to look as the opposite
people here don't understand the simple fact that the whole reparations question was raised by PiS as a crude form of "negotiating" with Germany (so with the EU center) to **** off and stop fighting their rule in Poland - I was and still am of opinion that it was not a good "negotiating" method and they never gave it any deeper thought - in the meantime the issue became a talking point in Poland and PiS cannot easily back out from it even if they wanted to - the thing is though that they kind of discovered that the question of reparations is a factor that sets them appart as patriots as opposed to Tusk administration (because the case grew that much)
however what most people here probably don't realize is that Polish right wing parties are at odds with Germany not because of the reparations issue for the most part but because of the current policies of the EU (mostly dictated by Germany) that rightwingers in Poland fear can be highly detrimental to the Polish economy