@Riot - Twitch Ulti/Runnans interaction with the new duskblade

So the new duskblade reads "UNIQUE Passive - Nightstalker: After being unseen for at least 1 second, your next basic attack will deal 50 + (200% Lethality) true damage on-hit."

Does that true damage apply on Twitch's Spray and Pray and/or interact with runnans bolts since it is an on-hit effect? (id like to believe it does but it could be really disgusting if it ends up interacting how i think it does)