Mockstalgia
Nostalgia for places/events/things that never occurred or do not exist.
She has Mockstalgia for Argletown
Mockstalgia
Any revisit of a thing, be it music, art or otherwise, that tries to evoke nostalgia but rings hollow like it's also mocking said thing. A thinly veiled inside joke
Bands like Wet Leg callback like 90's cool but are really mockstalgia because they don't believe it... they're goofing on it