In theory, if you have Remorse up and have Armor of the Inquisitor maxxed and running, plus Epic 2.0, Aura, 1st spire, and a raid-level healing focus on your gear, plus twin-heal up, you can self heal somewhere in the range of 60-70k with one 0.3 sec Burst heal. That might be what he was referring to.
Here's a screenshot of a recent self-heal with all of the above conditions up, except that I do not have a raid-level healing focus - mine is 55%, iirc.