They plan on doubling production. Yes, and I plan on doubling my muscle mass. When you want to double production you need to double sales first.
If the car starts at $80,000-90,000 before options, and it will, they won't sell 40,000 per year. But you will counter: Model S sells 50,000 cars per year at that price, so why can't Porsche. Except, Model S is a much more versatile car, that can be used as a family car and can be used to haul things around (I just transported two 2 meter long matrasses in mine). The Taycan is a 2+2, in which you probably don't want to sit in the back for more than half an hour. That is a limited market. I would be surprised if they can sustainably sell more than 10,000 to 15,000 per year.
An electric Panamera, Cayenne or Macan is another story. But it will be some years before those arrive. I hope they do though.