It isn't. I think he's just playing on the audience and the "hypersonic" buzzword. Majority of laymen don't know what an HGV or terminal course correction is, they only think that the weapon is so fast that it cannot be intercepted.As he also said that this is a hypersonic weapon; one of the prerequisites of hypersonic missiles is the fact that they manoeuvre during their midcourse flight making it difficult for exo atmospheric and similar interceptors to hit them.
All MRBMs (+1000km range) reach hypersonic speeds by their nature and nearly all of them go twice as fast. Being hypersonic doesn't mean anything. İkinci knows this, but his audience doesn't.