This comment is a choice example of how ideologues drape themselves in (what they call) science. Whether he was right or wrong, no fair person could read that Wikipedia bio and come away thinking that Thomas Gold was a "crank".
If there is radioactive material buried in the earth (there is), and there are geological structures that trap it (there are), then there will be underground deposits of helium (specifically Helium-4).
Other than the fact that the same rocks trapping helium can also trap natural gas, though, there is absolutely no further relation between the two. Why would there be? Helium is also found with deposits of radon gas, where no methane is present. BFD.
But it is made in big quantities by radioactive decay of elements inside the Earth. Whereupon most of it diffuses outward and escapes into space -- helium is a tiny, inert molecule which diffuses relatively easily even through many "solid" rocks. The only place it tends to pile up on the earth is inside relatively impermeable underground rock formations: The same ones that trap natural gas, and that often trap oil as well. That's the reason why helium and natural gas tend to be found together.
All of which is easily read at: