It totally depends on the equipment and software of the thieves, not on the way the key fob or other remote system works.I don’t know about the Porsche fob, but it’s entirely possible to avoid the amplification / relay attacks. You don’t measure signal strength but instead time to compute a secret based on a public key encryption pair shared with the fob.
measuring signal strength is amateur hour. Tesla’s key cards do that because they are cheap and they want to work with a variety of cheap phones interchangeably
It's a hackable system, no matter what.
Some insurance companies could even reject (expensive) cars with keyless entry in my country.
That's why it's an option (with a warning statement) in my configurator.