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According to Wikipedia that is because the bird-hipped ones looked like modern birds and the names came before we realized the error.
Hooray!
The real facts are the ones we met along the comments.
Dinosaur translates to “terrible lizard” so retaining outdated terminology is on brand.
To be fair, some of them were pretty damn terrible!
They’re so terrible at being lizard that they turn out to be birds…
Clint’s Reptiles had a good video on this.