the incident and radio intercept are probably real, but the video is of something completely different, it's TOS-1 strike. because of its tiny range the crew would absolutely know what they're hitting. the second part is from some drone drop video
I read that the Russians are laying landlines to improve communication between command posts but they're still using non secure channels as well. So there's probably a good chance they jammed themselves not aware that no landline was established/the landline was damaged.