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No, it is not damning evidence or strong evidence either way. It would be strong evidence only if treatment significantly reduces the probability of a pilot's committing suicide.

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> if treatment significantly reduces the probability of a pilot's committing suicide

Psychotherapy significantly reduces the risk of suicide. https://pmc.ncbi.nlm.nih.gov/articles/PMC6389707/

Does it bring the risk of suicide to general population baseline? And if not would you still want the affected people be responsible for hundreds of lives?

It doesn't look like it: it says that the risk of suicide attempt for those experiencing depression decreases 37% with psychotherapy. But the baseline 12 month suicide risk is ~14/100k, while those experiencing major depressive disorder are at ~120/100k. So ~5 fold elevated risk after psychotherapy.

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