Do not equate more ball deformation with more speed
More deformation on impact does not by itself mean that an object builds more energy. In the three-piece ball being described, the speaker says a rigid mantle adds resistance to build speed, while a low-compression two-piece ball lacks that extra layer and can lose output.
Channel: Club Champion
Watch official source at 10:10Why this context matters
The mantle explanation is tied to the three-piece ball construction being discussed.