They must have a pile of TS cells in their battery:
the racingendurance website says:
550V @ 56kwh (I guess 170 x 100AH LiFePo) for the battery.
(I found this by hovering over the battery on the car page)
That makes the 400km range believable, but with 540kg of cells.
Aluminium Ion does look to be credible, here is an ORNL Aluminium Ion battery presentation
This paper indicates that Aluminium Ion is a real technology and that it can offer the performance indicated. The theoretical energy density is 8140 Wh/kg vs 1462 for Lithium-Ion.
Interesting comments about valence electrons in aluminium (3) vs lithium (1) being responsible for the high energy density and also because the voltage is lower, non-flammable solvents (water based?) can be used.
I would be inclined to belive the claims, now for a beer cans to batteries campaign
It's not the end of the world, but I can see it from here.