The 2x1 means that a lift can be dual-purpose, and negates the need to have separate lifts. With 3m between the columns and totally unobstructed access to the vehicle underside, the battery can then be freely accessed, with plenty of room to work.
The 2x1 refers to the universal nature of the adaptor that comes with the C4XL EVA. Basically, the lift is dual-purpose, having both regular lifting arms and the specialist EVA arms, therefore negating the need to have separate lifts.
The 2x1 works is even better when used in conjunction with the Hofmann Megaplan EV Battery Lift.