It seems you were right.
www.tim.gr redirects to
www.wind.com.gr and the intro says the same. However the colours are of the Wind logo are different to those in Italy, it seems they are keeping the TIM colours.
Active Prepaid SIMs: United Mobile; (RC)
China Mobile; (USA)
TúYo; (D) Loop, Callya, Simyo; (A) Klax; (I) Wind; (B) Ay Yildiz
Former Prepaid SIMs: (RC) IF; (D) Free&Easy, Xtra; (A) Yesss; (UK) Pay&Go; (E) Movistar; (IS) Frelsi
Mobiles in use: Sagem my101X, Siemens M50,
Nokia 6800,
Siemens M65, Motorola E770, Samsung SGH-Z500, Nokia 9500
Previous Mobiles: Nokia 5130, Motorola V3688, Sagem myX-1, Siemens M55, NEC e313, SonyEricsson T200, Motorola V980, Siemens C45, Motorola V600