I personally saw Lurvi do 1.8k+ on Louhi in Nola's Black Legion raid. I was on my BS (Chengong) and did 1.3 and felt really happy about it. My jaw dropped to see him on top. I think he must have gotten a lucky streak on crits since it was a 45-50 second kill, crits weigh a lot.
He had T3 craft weapon. It was after combo skip fix.
I think he was also using the +5% crit and +700 CR pots.
I don't have the parser but I have no reason to make it up (I barely know him).