Does Willpower's +0.7% COUNTER Liquid Courage's -0.6% per Second, this debuff is killing me

Want to go for Uncollected, so many benefits to do so, I'm stuck on 5.1.6 and cant get over the hump. Saved for and unlocked Suicide masteries but it drains me immediately. Does willpower work against new debuffs only or will it counter the poison debuff from Liquid Courage also?
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Using a non immune champion will make you lose roughly 9-10% each fight due to the bleed but then you won't lose anything else thanks to willpower.