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...but harsher stiffer deformation...
I guess that's their thinking (from the Bike Radar article linked to by Miro_o):
"Wider tires roll faster than narrower ones: ...According to Wheel Energy, the key to reducing rolling resistance is minimizing the energy lost to casing deformation...Higher thread counts aren't always better: ...Wheel Energy claim medium-count casings (around 60tpi)... ...As compared to 120tpi casings, they can actually roll faster..."
Scilly.Suffolk
Wasn't it 30tpi gave more puncture protection, but harsher stiffer deformation resulting in lower rolling resistance than 60tpi (120->)