Looks like a great event. They sure did have some oldie goldies. That first picture has the skier pulled by a Volvo P40. Best looking car that Volvo ever built.
Zell am See is real Porsche country with the family owning land there, they have a number of Porsche fun runs. It sits just at the north end of the Grossglockner - Austria's version of Stelvio Pass. There was a Porsche event there the day we drove it this past September.
I can imagine that the Taycan with its 5,000+ lb weight, would have been a challenge to get around the icy corners.