This video does not prove anything at all. You could have had 819 points before the kill, then gotten 505 points after.
Resulting in 1324 points. Who knows? You never showed us your points before deathmatch.
Though I'll take your word (and everyone else's) that the bounty system is broken.
qqopp placed 400 bounty on Blamph and 400 bounty on Ecmep prior to the deathmatch one time, I killed them both but did not receive the 800 points in bounty.
Bounty is broken, we all know. but this isn't sufficient proof that you didn't get bounty, so you can't really be promised points.