The article indicates Porches and VWs are not the only vehicles being transported. It is possible there are also EVs on board.
I don't know this specific hull at all but it does not appear fully laden from the photo. Nothing indicates how many vehicles are aboard. Says it holds up to 4500. It also may be listing away from the photo vantage giving a false impression.
“The base 2021 Porsche Taycan starts at $79,900, which is one of the highest base prices in the luxury hybrid and electric car class.”
It’s possible one of these was aboard.