Not quite. He doesn't appear to be spamming SoC, which would be the only real way of scumbag DPSing the fluids next to the boss... Though he's definitely padding by DPSing fluids, no questions asked. Just that it's probably the fluids that are far from the boss. Take a look at this little bit of information:
This is OP:
http://www.worldoflogs.com/reports/0...?s=9353&e=9736
This is other warlock:
http://www.worldoflogs.com/reports/0...?s=9353&e=9736
Click on the "Damage by actor" tab on each of those pages and you can see that the other warlock did 90 million damage to living fluids, 10million to the boss, and 1.3 million to viscous horrors. Comparing that to OP's 60 million on fluids, 23 million on boss, and 8 million on horrors. I'm guessing since you're both affliction, the other warlock is simply using SB:SS on all of the living fluids that are far from the boss, then picking the lowest HP adds and using drain soul to get back 4 more shards to SB:SS 4 more fluids, and repeating... I could be wrong about that bit, I haven't looked into your logs in huge detail, but that's just my guess at a quick glance.