Doubtful to incorrect. I used the oil several years ago, and it was made/blended by Omni Specialty in Louisiana. Believe it actually stated that on the back. Omni states that they use base stocks from Exxon and several other suppliers. I would seriously doubt Mobil would allow their proprietary formula to be duplicated exactly.
Haven't used it for a long time, and it is possible that vendor changed, but doubtful. Omni and O'Reilly have had a business relationship for a very long time. That said, I have used Omni products successfully for a long time, mostly ATF.