I would say positive for wall hacking.  It would have been nice to have a longer demo, but as you watched every round when he rushed front office the only time he diverted was when enemy were present.  I watched it twice.  One pure then one with cool guy stuff on.  His cross hair placement always is near where t's are hiding.  His "awareness" gets the best of him and he follows straight in for the kill. 

The question of why he didn't kill the two T by snowman at the end is just his bad play style habit of reloading after killing someone. 

A brief narration of wallish things. 

900 tick: His initial rush diverting to avoid the T and later killing him in front office. 

8800 tick: He fires at the T crossing from longhall to bathroom thru the smoke.  2nd rnd he could have anticipated the t long hall/bathroom from the previous rnd.

16000 tick: Radar might have shown Hostage, but doubtful.  He never checks corners which makes it even more highly suspicious. His teammate does not turn when the bee-line to hostage commences.

22000 tick:  first time he ever cuts back to check for office rush.  Crosshair pans right to T, bad gameplay habit of his reload after every kill, then kills the next T.