No, the cleave debuff is added to the skill itself, there’s no attribute.
He was talking about Cleave debuff (50% bonus) + the Doppel c3 skill (which apparently gives +50% increases to slash skills) = 100%.
Although I think it’d be 1.5 * 1.5 = 2.25 since damage boosting effect like doppel c3 should be on T2 and the debuff on T3…could be wrong but eh.
