These people behave as though grandpa woke up after a 60 year sleep and he doesn’t know yet that Germany lost the war or that the wall has fallen (like that Germany movie Good Bye Lenin https://en.m.wikipedia.org/wiki/Good_Bye,_Lenin! )
It’s the old trope of a family dinner where the eldest suddenly starts reminiscing how great things in the “3rd Reich” were. If I may draw comparisons then I hear that over in the US the Americans then I hear that similar situations are experienced during a thanksgiving dinner, when a certain relative shows up.
Relics from the past that refuse to disappear.