It has been hinted that semi autonomous drones will be complementing these fighters. I really can't see a need for a second man. Zero 5th gen fighters have a second man and only the Indians wanted one for their FGFA version of the Su-57.I thought the most popular explaination for a twin seat 5th generation fighter is the second man is responsible for coordinating a flight of stealth UCAVs acting as wingman?
I still doubt the development is twin seat version but would interpret it has indicating drone controller. Someone closer to the frontline and not ground or Y-series based hanging very far back. The second pilot would have better SA and probably get more up to date information. Could also act and command drones faster.
More likely it's just a false rumour.