Because there's no 25 sec Athene mp10 Azmodan solo kill. It's a 4 player work, all blowing their cooldowns and as we all know it's easier for 4 players (only 310% hitpoints instead of 400% while benefitting from all auras, totems, buffs etc).
I've had the discussion with one of the mods a few days ago. The news updates on the front page are not intended to give updates for the current world record, but to show what each class is capable of, once a nice vid becomes available.
His biggest achievement is trolling the whole WoW/D3 community so hard that I laugh my ass off every time I watch the video and read the posted comments from you, the know-it-all crying noobs.
Now this comes from a guy who can actually spell the word "achievement".
You shouldn't throw rocks at other peoples grammar if you can't do it right yourself (read I know my English is terrible but yours isn't that much better where as my mistake was a typo)
However he did try to troll the sc2 community but he failed at that when he realized he wouldn't even get close to being good so he gave up on that. And honnestly the most retarded thing is people like him can sustain themself on being a troll on the internet