"turned to be" is probably a mistake. "turned out to be" is correct.

The phrasal verb “turn out” is used to kind of describe how things will end up, or the results/conclusion of something. It’s easier to explain with examples. I didn’t want to go the party, but it turned out to be amazing. I hope my son doesn’t turn out to be a criminal. Actually, it’s turning out to be a nice day. As for “turned to be”, I can’t really think of what situation you would use this.. “He turned to be punched in the face” ? That would mean that he turned his body so that he could be punched in the more easily. Lol. I don’t know when else you would use this.