I think that Kyiv likely has layered defenses but the Kinzhal isn't really interceptable by a Gepard/CIWS by the looks of it.
The only thing capable of protecting a Patriot from Kinzhal seems to be the Patriot battery.
The Gepard would be for point defence of the Patriot itself, should either the missiles it sent fail, or it have run out of missiles to fire.
The point of point defence is that they are basically pointing towards something aiming at them. (So the Gepard type system would face the incoming missile)
At that point speed etc are semi irrelevant since the targeting can be semi imprecise. There is an old saying about no substitute for volume of lead being fired downrange and this is what this would be aiming for, much like the point defence on ships does.
Your literally firing hundreds of rounds into a very small target area into the same path the incoming missile (or plane etc) is taking
Its very different to trying to intercept something on another arc.
The patriots may need a small local point defence phalanx or something. Literally part of the significant units purely for their own self defence.
They would likely by that point still suffer some collateral damage but that would be significantly less than the direct impact (which would likely be total loss)
I mean hell maybe it already exists in theory, the fire control of Patriot may have hooks to unused equipment. It does seem a bit of a weakness that such an advanced system has no local point defence.