Türkische Zyprioten könnten nach der Zwei-Staaten-Lösung die EU-Staatsbürgerschaft verlieren, warnt Talat

They most definitely will not „lose“ EU citzenship.

What could happen, is that any „TRNC citizens“ post Taksim who are not already also Cypriot citizens are likely to lose their right to apply for RoC citizenship. Although ultimately whether citizenship is granted or not is up to the RoC. This is similar to Romania and Moldova, although not identical.

If the RoC continues to grant citizenship to what it considers „Turkish Cypriots“, then the EU is unlikely to make an issue of it, ever. What would cause action from the EU is if the RoC is found to be willfully granting RoC citizenship to non-TCs.