So... I remember that --^ stuff back in the day.
On topic, the current Porsche coolant is (or is identical to) Pentofrost E:
https://crpautomotive.com/wp-conten...roduct-Data-Sheet-Antifreeze-Pentofrost-E.pdf
It, like all other coolants (at least those used by Germans) is enthylene glycol-based:
https://crpautomotive.com/wp-content/uploads/2020/06/Pentosin-SDS-Antifreeze-Pentofrost-E-EN.pdf
What differentiates coolants is the formulation of the additive package.
Enthylene glycol eats aluminum. Heads and block in our Porsches are aluminum. The coolant additive package prevents the enthylene glycol from eating the aluminum.
In the old days coolant had silicates and phosphates as the major components of the additive packages. They work great. But, they also 'go away' after a couple of years so the change interval was frequent. The frequent change intervals, silicates and phosphates were deemed environmentally unsound. Manufacturers have been pushed for decades to increase change intervals and to use more 'environmentally-friendly' chemicals. There have been numerous reformulations of coolant over the last 30 years and there have been some disasters - as far as damage to cars is concerned - as a result. There have been no regulations that push manufactures to make sure that the coolant formulations do not turn engine blocks and heads into Swiss cheese after a decade or many tens of thousands of miles.
Anyone's faith in "lifetime fluid" is a bet on how long-lasting is the additive package and how well-matched it actually is for the materials with which it is in contact.
As someone who routinely sees what old/bad coolant does to aluminum Porsche heads (and blocks if left long enough) and has spent non-trivial time over the years researching coolants, I absolutely do not believe in lifetime coolants (or, indeed, lifetime automotive fluids of any flavor.)
If you are going to 'trade out' of your Porsche in 0 to 10 years then the only motivation to refresh fluids is "doing the right thing."
If you want to be driving your gas-powered mid-engined Porsche in 2035, you must treat all the fluids as wear items.
This is also a reminder to self to change the coolant (and PDK fluid) on my '15. It's past due based upon my own methodology even if it has only 25k-miles.