I think this might be what they are talking about. Brilliant video, the story just builds and builds and builds. https://youtu.be/K4yCXIZ32lk

Are there other gasses that could be used. E.g some of the noble gasses like argon or neon?

Metals are made of crystals, they usually defourm along the grain boundaries and fatigue cracks also grow along them. By eliminating those boundaries you reduce the chance for fatigue cracks and make the overall blade stronger.

Also lots of other places (YouTube as an example) allow you to migrate your account indefinitely, over a decade after they were purchased.

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