The Wrong Way to Do Science is to start with a conclusion, and then look for evidence to back it up.
Global warming is a fact, and once we quantify methane emissions we will have scientific proof that the substrate on the seabed is melting and leaking methane. If these methane deposits reach the atmosphere, they will deepen the greenhouse effect, which, in turn, will promote further methane release, thus closing the circle and ramping up warming.
By quantifying the emissions and establishing their magnitude, we will be able to begin to determine how they will affect global warming. We believe there is a huge amount of destabilized methane deposits that may leak into the atmosphere and ramp up warming.
I have little doubt that the author will find exactly what he expects to find. A better approach would be to collect the data and analyze it objectively.