Not "override" in the sense of changing local law at the conclusion of the case, but "override" in the sense of a trade tribunal deciding against a given state's laws (on the basis of a prior trade agreement), and the state having to pay damages etc. so that it does not breach the previous trade agreement: https://www.ag.gov.au/tobaccoplainpackaging (ongoing, at least with WTO it seems, but not the original investor-state case. The latter was/is Australia vs. Phillip Morris Asia.)

That is most probably evidence for a rather weaker point, cf. the one you argued against.