Because everyone is following the SSP structure in VAG group. Porsche will have SSP Sport, Audi will use a tuned down version of it and a Skoda will have SSP-Mini or something.
SSP Sport is a Porsche platform that
they don’t need to make bespoke Porsche EV platforms because SSP Sport is their own modification of the SSP, similar to PPE and PPE Sport in the Cayenne (or whatever the name is).
this is good for granular vehicle control as Porsche can tweak what they want...