"creationists trying to disprove it (by claiming that Archaeopteryx is simply a bird)." - one can't "disprove" anything simply "by claiming" something else. However, using science, one theoretically could demonstrate flaws in a scientifically established theory which would likely result in the theory simply being amended, not deemed (entirely) "wrong" or disproven.
The facts disprove, i.e. show that birds could not have descended from dinosaurs, because dinos had moving femurs. Birds have fixed femurs to prevent their lungs from collapsing when they inhale. Their lung formations are different as discovered by Oregon State University researchers.
They didn't "descend" from dinosaurs, they are an evolutionary path different from other dinosaurs. Dinosaurs were on the Earth for millions of years, why would you think they all are supposed to evolve the same way?
there is not a single bit of evidence that they were here millions of yrs,,,
that is pure speculation based on poor assumptions,,,