If this report has validity and it works, then do it.
As much difficulty as the folks are having manipulating relatively simple devices at that depth, I doubt many of us would feel all that comfortable with the same guys using nukes!
I’ve heard others say that the ocean floor in the Gulf, and particularly in this area, is so porous that a nuclear blast would only open more leaks.
“If this report has validity and it works, then do it.”
The US has experience in underground nuclear explosions in gas wells too. Project Rulison and Gas Buggy in the 1970s.
They were attempts to fracture the rock in very low permeability formations in order to create improved flow channels tthorugh which gas can be produced.
The problem they found out was that the blast was so hot it melted all the rock surrounding the well and turned it essentially into glass. It was the reverse of what was intended.
So yes, you can probably stop the flow from the blowout.