Here's the announcement in English (dated 06.06.12!)
Frequent Travellers: access change regulation to Contract Lounges
Frequent Travellers travelling in Economy Class on a flight operated by a Star Alliance carrier can enjoy their time at the airport in an Austrian Airlines, Lufthansa or SWISS Business Lounge, as well as, in the lounges of Miles & More partners: Brussels Airlines, Luxair* and LOT Polish Airlines. Unfortunately, access to the present Contract Lounges will no longer be possible as of 1 September 2012.
*Only in connection with a flight operated by Austrian Airlines, Lufthansa, Luxair, SWISS
So it seems clear FTLs can still access lounges operated by LH, LX, OS, SN, LO and LG when flying on *A carriers. I also don't understand why ZRH based FTLs will be so hard hit. FTLs who fly on longhaul LX in Y may be hit if they lose lounge access in many outstations.