There is a difference between recycling an existing story by re-imagining it and throwing out generic slop with a nostalgia filter. The Terminator and Halloween are the same story if you ignore the details. Indiana Jones was an homage to the old adventure serials.

Having the same overall structure can make something the same story at the surface level, but how it is implemented is what makes it fresh and original. Nostalgia bait is not putting the effort into making something new and fun, but instead focusing on how they can cram member berries in so people can remember the better movie as a distraction from the slop they are watching.

Not all movies with nostalgia moments are nostalgia bait either. Good sequels exist too.