Goldschmidt’s theory was a theory of evolution differing from previously accepted ideas. It was not at all a theory of non-evolution. That argument was settled long ago, and there is no scientific evidence that it was settled wrongly. Nothing in the research on fruit flies in any way refutes evolution (incidentally, geneticists like a certain species of fruit fly because it has only four pairs of chromosomes).
That's what I mean and what people mean about evolution being a pseudoscience. If total disproofs like that can be thus just totally shrugged off on a perpetual basis by the true believers, then you have to view whatever it is they're talking about as unfalsifiable (at least to them) and thus a pseudoscience by definition.