How was Laplace’s demon disapproved?

Question

From what I read it was by the Heisenberg uncertainty principle but I don’t understand how, too technical for me when I read up on the topic

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Answer 1

Its just incompatible with the largely accepted interpretation of quantum mechanics. Because in the so called “Copenhagen interpretation”, it is by postulate (assumed) true that we can know everything knowable about a system, but that some properties are not knowable so a hypothetical being that knows all positions and momenta is impossible.

There’s been more recent attempts that mathematically show using computation, that any Laplace demons are inherently uncomputable by other Laplace demons, so you can’t have any to start with.