This is not actually unusual at all. He did not sustain this damage, so it was probably just stacked Tac buffs. Tacs can easily hit very high bursts over a period of about 30 seconds with GDF+APA+FOMM+TacFleet, especially when you are helping with additional debuffing. Values of 60K+ DPS are not actually uncommon over such short durations.
That's pretty much it.
Even with otherwise crappy gear and a non-perfect setup you can reach enormous numbers in certain, short fights, given the right circumstances. The right timing on the point-defense console during the carrier fight in CSE can amount to 8k+ dps for that encounter alone for example.