Positive how? He sort of alluded to there being a significant difference between groups, but the groups weren’t unblinded yet. However, if the study was about exercise and Rapamycin, a difference means Rapamycin was detrimental vs control, or was beneficial vs control. If Rapamycin doesn’t affect exercise, there’s no significant difference to report.
I can’t see how a literal growth pathway inhibitor could be beneficial during exercise, so I’d have to assume it was detrimental. (Though I will of course love to be wrong)