Gonna check through this very closely. Been playing with him for years and hes a good friend.
Edit: Checked it through very closely with wireframe on and off. Most of the ticks are quite easy to explain if you turn up your volume.
Only 15k and 32k is a bit suspicous in my opinion. Since i'm not ULA my word doesn't really matter but my opinion is that there isn't enough evidence to say he's wallhacking.
2k/7,7k: You can very clearly hear that enemy is running there. He even starts walking so he can hear better.
15k: Can't explain that as it's quite suspicous. He's looking at that area so it's not impossible that it's reflexes but the suspicous part is that he starts aiming at tunnel for a while without any sound from the enemy running through there.
16,5k You can hear him shooting at a teammate so sound and radar makes that enemy's location easy to find.
17k: You can very easily hear him run towards the ramp.
19k: Teammate killed by enemy which you can clearly hear the enemies shooting.
19,6k: You can see the enemy running towards spawn at 19k which is why it makes perfectly sense to predict that the enemy is running towards that narrow path near spawn.
22k: You can cleary see the enemy before D-town moves to look through the tunnel.
24k: You can hear enemies shooting at that side of the map and D-town has been looking through that tunnel everytime he's at that corner during the whole map.
29k: D-town is the only one alive and you can hear footsteps up there at 28,6k.
32k: Seems a bit suspicious with the pre-fire around corner but he knew the enemy was there as you clearly saw him and it's not enough time for the enemy to run to the ramp.