I haven't run any numbers but I suspect they're referring to the energy cost of cracking water for hydrogen Vs. the energy costs of bleeding off and saving hydrogen as a side product from LNG and hydrocarben wells.

Even that makes no sense. Turning methane in electrical power is about 60% efficient in combined cycle plants. Electrolysers are at least 50% efficient. Where is this 10x coming from?

> Where is this 10x coming from?

You would have to ask them again, demanding their thought process or sources from third parties like myself is fruitless.