Yes, it is a 3-4. This was KC's run downs defense.
@quickccc
But you do realize (finally?) that KC Chiefs are a base 4-3 scheme, right ?
That's the bottom i've been describing to you and Damien Wilson's role as an OLB in that base defense.
Regardless of what single snap shot of a "situational " formation that the Chiefs D' are using in their defense, which could be
an overload, change up, nickel, etc. .....
And as i've said before, you don't have to take just my word for it, you can always go to KC chiefs full games per YouTube videos yourself
see their base defense, roles of players, see their change up, 3rd down nickel and hybrids during the course of the game, ..and defense in it's entirety ..vs a simple single snap shot where you have to wildly guess formations n situations that they are using.
https://www.chiefs.com/team/depth-chart (4-3 defense)