That's not in the cable

Well, Sherlock, good catch! That's an affing wireless charging system. /S

The 90 % efficiency claimed in the OP - is the claimed TOTAL efficiency of the PRODUCT by Porsche (wireless charging station). Of course "it's not in the cable" (rofl), it's in ALL the electric components of the system - which is OVERALL less efficient than a similar (as in function and provided power) charging station.

Similar, but noticably POORER in efficiency (~ it has 10% more losses than a similar wired charging solution). As even the Porsche marketing claims.

If you still fail to get it - then you might want to follow your own unsolicited advice:

Have a web search.

I can rewrite the whole press release by Porsche for you, but i can not understand it for you.