Again... my original point is he doesn’t have a good track record building a major league roster. I can’t fathom how you can ascribe his rebuild efforts as just tanking as if that only involves losing games.
Take some time and read up on the Padres rebuild. Preller has done impressive work in the amateur markets.
If a GM is good at acquiring prospects, and then makes terrible moves converting those assets into MLB wins, is he anything other than a bad GM?