No, nullify prevents active skills from being activated by other sources.

For instance, if a champ has a passive that says  "activates [a2] when [whatever condition] happens" nullify would prevent it. Some partner champs have a skill that activates when the partner does somethng, nullify would prevent that.

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Does the description stated prevent active skill from activated by "other source" ??

No!! Not at all...what it mentioned is under nullify debuff cannot have skill activated! Logically should mean active skill shouldn't be activated at all!! 

This is such a poor design or statement to mislead others!! Worst skillset ever!!

No argument that it's badly worded. It's been a trend recently to have odd skills with big wall of text descriptions that do a piss-poor job of actually explaining it.

Nullify doesn't block anything at the moment not extra turns, not skill activations. It's basically a useless debuff that occasionally blocks some random stuff, but not what the description says. Likewise, Leo's passive isn't working properly either. And btw, the German description of Nullify says it stops champions from activating their skills period. I'm not sure if this collab will be remembered in a good way, that's for sure 

I don't know since the game is broken and won't run on IOS.

Nullify is supposed to stop things like, for example, Lady Noelle's A2 from activating Sir Nicholas's A3. However, it is true that it has not been properly explained nor explored but once people start using it more over the next few weeks/months its function will make sense and potential will become clear.

I was shocked when i herad people were doing this titian event for and the fusion.

Both are average at besy

The reason I am saying I was shocked when i heard of non whales going for these 2 knowing that the guarantee event for Raulph and leo are just about.

Save your resources and wait, dont fall for the bait.