Is it just me or this sentence makes no mathematical sense at all? "If you’re running squeaky clean A/B tests at 95% statistical significance and you run 20 te

Is it just me or this sentence makes no mathematical sense at all? "If you’re running squeaky clean A/B tests at 95% statistical significance and you run 20 tests this year, odds are one of the results you report (and act on) is going to be straight up wrong."