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the entry for Ghazkull states that during his Waaaagh his 2+ saving throw becomes Invulnerable

My question is: does that mean he dosen't have an armor save during his Waaagh and therefore would Psycannons and Incinerators deny him a save?

The entry for Ghaz is that his "saving throw" becomes invulnerable, it doesn't mention armor at all. I would assume for both RAW and RAI he should get his 2++.

You aren't familiar with Psycannons and Incinerators are you. Psycannons are Str6 AP4, Incinerators are heavy flamers. Both Ignore Invulnerable saves.

Yes, I think his waaagh-powered save would be denied by an incinerator or psycannon. Because it specifically says that his save _is_ invulnerable for the duration, not that he gets an extra save or that he may choose to use it as invulnerable.

If you want a fluff reasoning, gork/mork transforms his armor to raw green powa for the duration of his waaagh. So the DH weapons would be the exact right tools to hunt him.

What you are asking is: does Ghazghull ONLY get a 2+ invulnerable, in a similar fashion to the old turboboost.

From my reading of the rule he loses his armour save and gains a 2++ save instead. As such both GK weapons make him go bye bye....

Yes, I would say so. Source: The new SM Legion of the Damned has "their saving throw is invulnerable". They have no amror save, heck, they don't even have power armor. Anyways, so yes, he only gets his 2++, no normal save.
So demonhunter weapons would destroy him.

Yup, he loses his armour save and gains an Invulnerable.

Just remember to Waaagh! at a point when you can't be hit by them