The alligation is based on Thailand's police intelligence who intercepted these fake Turkish citizens en route to Turkey using Turkish passport.
What kind of question is that?

Uyghurs are Chinese citizens even the criminal ones, it is surely China's concern and NOBODY else is in any position to ask such question.
Anyone leaving China to join terrorist groups are enemy of China. You seem to making different characterization of the west and Turkey on the very same conduct. Are you ethnic Turkish being Erdogan's fan?
Is Kurds insignificant minority? Turkey must be exaggerating the non-issue of Kurdish independent movement in Turkey.
Remember the Chinese proverb "己所不欲,勿施于人"/ treat others as you want to be treated, otherwise you will have to taste your own medicine.