The "Turbo" designation on a Porsche no longer means it has a turbocharged engine vs a normally aspirated engine like the lesser models. A few years ago, the entire line (except the GT3/GT3RS - and obviously the Taycan) switched to turbocharged engines to meet fuel economy and emissions standards.
Essentially, "Turbo" and "Turbo S" have been co-opted by the marketing department to mean penultimate and best models in the family, respectively. Yes, it's kind of silly on an EV, but, for Porschephiles, it makes sense.