the first tick mentioned you can hear the guys footsteps (explained)
at 8000 he knew the guy was going into T spawn (unexplained)
10000 sees the guy and goes with it, don't really see anything (nothing here)
13500 you can hear the footsteps (explained)
19000 you can hear footsteps (explained)
22000 you can hear footsteps (explained)
82000 again, you can hear footsteps as the guy goes up the ramp to the concrete walkway (explained)
84000 and again, more footsteps (explained)
101000 more footsteps (explained)
116000 in the midst of a fire fight, he hides to reload, hearing the footsteps he comes out to kill him (explained)
120000 s3 getting shot at by a ct puts him on the radar for him to see (explained)
124000 honestly don't see anything, no one is there, nothing happens (nothing here)
131000 hears him fly through the door due, hides, hears him shooting his teammate and then he jumps out and shoots him (explained)
134000 put yourself on radar after killing his teammate (explained)
135000 more footsteps (explained)
140000 more footsteps (explained)

out of all that only 1 tick you mentioned cant be explained.
almost every tick mentioned you can hear footsteps or the person was on radar.
I'm gonna have to go with no on the walls.
but he should get a temp ban for ghosting.