Nope, this is not an ISP. Turk Telekom is stated-owned broadband internet (infrastructure) company. All of the ISPs are having the same peering. I checked your link through TTNet. We also have Superonline and Smile as main ISPs.
So, still 30% state owned. As one point of reference, the German government still holds 15% directly plus 17% indirectly of Deutsche Telekom. France and Orange (nee France Telecom) are similar.