the question is, how is the flow dealing 0 dmg, 

is it just bugged or useless and should all kunos reroll

Useless. No damage in pvp. Little to no damage in pve. Awakening kuno damage is kinda low generally. Needs buff instead of weird changes that kills combos with down smashes.

I think most awaken kunos already gave up. I checked again today on Garmoth to see if we were doing better than before the update... We somehow got worse at places we were mediocre at. Then for other side where we were terrible we are still awful trash loot may have raised by at most 2%. This was just a hard nerf all around considering it was our hardest hitting skill.

A few of the awaken kunos(outside my self) i know just plain quit after a week because she's gone from being slightly above succ nova post buff now to being worse than what she was ... PA are more interested in removing Owpvp(to create controversy )and increasing p2w then fixing issues with classes if anything PA are trying to get ready to remove the kuno playerbase by how terrible their incompetence has gotten.

Then somehow succ zerk exists...

I am convinced the skill is either A: Bugged as they have bugged summon skills for Kuno before and had to patch/Buff the skills to do what they were intended to do for example Delighted Blast after the buffs kuno got a while ago where Delighted Blast did little to no damage and the cc's werent proccing how they were supposed to. That or B: the skill doesnt scale with AP and even tho its got 50% accuracy and 20 hits on it its still not doing jack in PVE and certainly not anything in PVP. If there intention was to buff Kuno they need to do something about this new skill and i'd say its the ONLY thing they need to do remedy them taking away our old Flow: Wrath which actually did something in both PVE and PVP, They need to make Pinwheel do something in PVE and they need to make it do a bit more in PVP too honestly. 

It is a summon.