That is what makes it economical to ship bauxite from all over the world there, and have it manufactured to aluminum, and exported.
So this is a nice topping on the cake, to have even some of the last bits of CO2 from the process eliminated.
I don't see why this wouldn't apply to other sites elsewhere. How they generate their elictricity is another matter.
And it sounds like a great idea to me. It's just not particularly interesting from the perspective of aluminum smelting.
https://royalsociety.org/topics-policy/projects/low-carbon-e...
I think it is in there where he mentions an interesting trade off between the environmental cost of making aluminium vs the long term savings of making, for example, car parts out of aluminium rather than say cast iron which they would have been made from in the past.
Which is to say, it's not immediately clear that increasing the cost of aluminium to encompass the externalities of shipping it is actually a net benefit to the planet as a whole.