That video was interesting, but shows a lack of ability to stop that S400. All that threesome can do is target the launchers after one has launched, and try to trick them into expending all their ammo on drones.
The HARM slightly exceed Mach 2 and itself is a target for this system.
And an S400 in the air uses a passive fire and forget seeker. There is no radar signal it follows or emits.
Don’t minimize this nasty thing.
Basically the only way to interdict it is to trick them into expending them wastefully on drones, or to declare war and go after the launchers in a full war package.
That vid shows how the USAF could indeed reach and hit a high value target protected by S400s. And I believe we could. But there would be bad losses.
That is the reason the Israelis attacked them last year as the S300s were being unloaded. Once they are operational, they are a long range handful.
Essentially they can establish a no fly zone over half of Turkey with one.