Taxi tests wasn't started yet? Then that Habertürk piece was correct.
"KAAN will make its first flight in a few weeks
According to the information we have obtained, KAAN's ejection seat tests, full-length static tests, inertial and static tests of the control surfaces, landing gear drop tests, avionic system tests in the system integration laboratory, fuel tests and engine start-up tests have been carried out so far. Following the completion of ground tests and taxi tests, KAAN is expected to make its first flight in a few weeks."