It's the same as stock.
The red/white wires from the regulator are joined with the red battery feed at the starter relay by the original design. He's just made the connection before the relay, as he should when wiring in a new fuse holder(s).
I thought you rewired your bike.
Get your ohmmeter. The operating coil of the solenoid will have a specific resistance. Generally around 20-40 ohms. The two spade terminals that show continuity WITH a resistance value are the leads for the starter switch and ground. Y/R. G/R