I have watched this demo twice, once without and once with r_xdebug 2. Some rounds may not actually be questionable but there is still plenty left, and everyone with a reasonable experience in this game can see with r_xdebug 2 (the hackers point of view) that his actions make perfect sense and there is no doubt about wallhacking.
round 1 1:03 peek to "spot" mid
round 6 straight b, no checking, after plant going through smoke to get behind 2 players
round 8 straight b, no checking, bomb planted, obvious mid avoid
round 15 1:19 looks and shoots straight at spawn roof player
round 16 1:39 aims right but fails
round 17 1:39 prefires spawn roof and kills shortly after, knows the second player is banana and hunts him
round 18 1:50 knows but misses, 1:30 info given to QZR?
round 19 knows every position from start
round 20 1v1 info given? kinG keeps waiting for player in B alley?
round 1 no checking, 1:44 casually jumps into smoke, prefires
round 2 again knows positions and just goes into open, 1:42 scans the player to the left in A alley
round 3 hacker dead but info given to QZR who wallaims and knows exact position
round 4 hacker dead, 1:37+ but again info given to QZR who follows the player
round 7 again just goes straight to the enemy, dies..
round 8 1:42 nadeesp? 0:55+ both magically know player is mg, 0:15+ kinG turns and follows through walls
round 9 obvious hunting of 2 players, no checking at all
round 10 cant aim properly, but can position himself godlike
round 13 1:48 stops there, never checked before
round 14 doesnt check now like previous round but is rushing instead
round 16 straight push into 1 player, and peek to spot truck player
round 17 rushing to A plant, no checks done
round 18 stopping to "check" stuff on A now, QZR not checking for defuse TWICE! clearly getting info or wallhacking as well
round 20 again stopping to "check" when somebody is there, 1:33 blatant smoke kill, bomb planted, QZR left, ups that one is already dead, avoiding to be seen from boxes