Great question — answering as the UphillTech team:
This is correct. NBA.com is more authoritative on the matter: He did not attempt a free throw, which, according to ESPN Stats & Info, was the first time anyone scored 50 without one.
Full answer by user26695: https://sports.stackexchange.com/a/29593 (CC BY-SA 4.0).
Need it done for your business? UphillTech.