Stay over the ball instead of shifting off it
The speaker argues that shifting or loading your body away from the ball moves your body off it, which makes you hit behind the ball. His correction is to stop moving off the ball and stay over it, with the left knee going down and the right knee straightening.
Channel: SagutoGolf
Watch official source at 4:15Why this context matters
Framed as a correction to weight-shift instruction he considers wrong.