They may have waited in between pulls, meaning focus aim would be up at the start of every pull. That's the only way I could see a ranger getting 100% hit rate on those mobs, especially without a dirge or brawler.
With DPS around 200k the timers are nearly perfect... with 250k you have a crap up every second fight. So its not about the higher the raid DPS the higher each individual DPS.
Another one parse from Eden.
x3 raid 200k rdps.
Group: inq, troub, warlock, dirge, illu.
4 double pulls, no w8ing before pulls, to hit auto is 97,8
No swash, bruiser, monk.