It's a rumor and nothing else. It also has been discussed in the other german Fourm vielfliegertreff.de.

This <post> denies any word about A3 and LCC. The greek newspaper (?) article focuses on the economical situation of the airport of SKG that is loosing traffic. Lots of airlines just pulled back flights to SKG...

So, there is no reason to be worried about this rumor. For A3 it is important to be member in a alliance to expand traffic ;o).