A lot of assumptions here that probably aren't worth making without more info -- For example it could certainly be the case that there was a "real" file that worked and the bug was in the "upload verified artifact to CDN code" or something, at which point it passes a lot of things before the failure.
We don't have the answers, but I'm not in a rush to assume that they don't test anything they put out at all on Windows.
We don't have the answers, but I'm not in a rush to assume that they don't test anything they put out at all on Windows.