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Interesting way to put it, but I don’t think that’s how it works. 
Nominalizing is making something a noun.
Like, すしが好き. I like sushi.
すしを食べるのが好き. I like eating sushi.
You can’t really nominalize 作戦がある。in this case to “having a plan”, nor any of the other uses of のです。
Like, 食べないの? You’re not going to eat?
いいの? Is it okay?
I just can’t compute that idea. 
Afaik, のです or んです or の, are just ways to make your sentence feel more natural in the way that it’s not just a fact, but an explanation, that you’re either giving or asking for.
Instead of saying, are you not eating?
It becomes, (why) are you not eating?
Instead of, is it ok?
It becomes, (are you sure) it’s ok?
Instead of, 作戦がある。I have a plan. (Fact)
It becomes, 作戦があるの。(Because) I have a plan. Or something like that.
Basically what he explains here: Meaning of のです/んです - #2 by jprspereira