bp themselves still talks about "if we can decarbonise it's production" (it being hydrogen). They have published in more detail, but they've not made it as easy to find. If you do some searching you can find their approach in more detail tho.

For the rest: knowing an electric device does not care where the electricity came from. You can double check this by seeing if the same smartphone exists all over the planet.

https://www.bp.com/en/global/corporate/what-we-do/hydrogen.html