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I don't think there is a replication crisis in astronomy. It's important not to generalize from other fields

This is very field specific. As sibling poster mentioned, claiming it true for all of science is throwing out the baby with the bathwater.

Science and predictive models are two entirely different things. A study !== science.

Science is about replication of results.

For example, if Alice did X and got Y, then published a paper about it, and Bob did X and got Y, and Charlie did X and got Y, then X->Y is scientifically proven.

If well known and proven scientist Alice said that X may cause Y, then it is just Alice words, not a science.