Tried the spawn in a 4man group; 440knight, 500ranger, 510 druid, 540ranger. We barely did ~2.3kk/h clean. 5.1kk gained in one hour with boost and voucher active.
It is near impossible to reach the 2695k/h number in the image posted previously unless you ignore flames existing and there's no walking between pulls.
It feels better with the lower amount of waiting for flames with 4 players though, and if we did reach the advertised amount of experience it would be good enough to hunt there outside of this test.