The comment about "worst team" was in the context of Happ's pitching performance, and it might be accurate referring to the Pirates offense. Over 2020-2021, the Pirates are tied with Colorado for the worst team wRC+ in MLB at 76, and right now the Pirates are without by far their best hitter in that time frame (Ke'Bryan Hayes, 196). I don't know that looking at the 20 game sample of 2021 in isolation would be too meaningful yet for this kind of measure. If you want to expand it to overall, keep in mind the Pirates recent pitching and run prevention probably look better than they really are too -- in 2020, the Pirates got to exclusively face the two worst hitting divisions in MLB (the AL & NL Central). The Tigers and Rangers are also very bad teams, so it's definitely debatable overall, but the Pirates still have the worst cumulative W-L record over 2020-2021. FWIW, the Pirates took 2 of 3 in Detroit this week, but both teams scored 9 runs over the series, so it was probably a draw by Pythag.