That "uh" might be significant, or not. We'll find out Thursday.
I don't think that wouldn't put Maxima into full steely-eyed glare mode. She wouldn't approve, but it wouldn't really be her business. It is possible that the Sydneys didn't tell Mom she was learning to scuba dive, because Moms worry. However, I'm guessing that Dad just blurted out something more significant.