Keep wedge hand speed matched to the center
For the soft wedge shot being demonstrated, the coach does not want extra hand speed. Keep the hands moving with the body center and feel as though the shaft returns with the loft it started with; the coach notes that the club will still lag slightly.
Channel: PorzakGolf
Watch official source at 8:58Why this context matters
The instruction is for the softer wedge trajectory demonstrated in this passage, not a general full-swing rule.