Unfortunately this appears to be correct. Very disappointing.
According to:
http://www.starallianceemployees.com...tml?&tx_ttnews[tt_news]=6260&tx_ttnews[backPid]=14&cHash=57050ab438
The lounge is available to first and business class customers as well as Star Alliance Gold card holders travelling from Terminal 1 on Air China, ANA, Asiana Airlines, EGYPTAIR, LOT Polish Airlines, Lufthansa, Singapore Airlines, TAP Portugal, THAI, Turkish Airlines, US Airways and regional member carriers Adria Airways and Croatia Airlines.