On paper the top-level explanation of the technology makes sense by virtue of an Aluminum ion being able to transfer 3 electrons vs Lithium's single electron thereby achieving a faster discharge rate seems plausible. However when taking into account molecular weight it becomes a different story, at least as far as energy density is concerned. Lithium's molecular weight is 7 while Aluminum's is 27. So we'd be using 28.5% more mass to achieve the same energy density. And there is also the increased number of Aluminum's orbital shells to take into account so more volume would be require vs Lithium.
How much this can be offset by the apparent lack of need for a heating/cooling system for vehicle tier applications remains to be seen. I'm guardedly cautious but hopeful.