Ok now try my way of calculation.
I saw a Mach wave in the video. You may have seen it too. Here is the screenshot.
Can you see the very faint Parabola?
View attachment 177500
Here it is again, i hand drew a line over it .
View attachment 177501
Now i used the Mach wave formula as explained here
View attachment 177502
The Mu angle i Gimped and i seems to be anywhere between 33 and 36 degrees.
So as per that formula, and the mean angle of 34 degrees of the shock wave, the velocity at impact is 2191 Kph or Mach 1.78.
The mach wave screenshot was from this Potato cam video from ISPR which is 360p , and you can see the Supersonic shockwave moving on the ground.
There is only one frame of the moment just after the impact where the missile impact point and the Mach wave are in the same picture. I used that frame.
Here is the reference video.