If the electronics industry needs it for an inert atmosphere, they would likely use argon. They would not even buy argon. It is cheaper to buy a argon liquifier (from air).
Leak testing? I guess helium is a good choice.
The video also mentioned NMR. From a quick search, I see that the research scientists use liquid helium surrounded by liquid nitrogen. I use to think they used nitrogen but I guess it is hard to make a coil with ceramic barium titanium copper stuff. If someone can make a metal that becomes a superconductor at 77 K, they could change the industry.