Definitely a mistake and there is a second a mistake and both are repeated on the Haynes manual.
Nice one. When I was trying to figure out how the alarm is connected I saw that and thought that's a funny loop
Now that you pointed it out, the way it was drawn it would make the connection through the alarm pointless because the ground from the starter switch already goes straight to the cut-off relay
I think there might be another small mistake on the black and white diagram. See the female connector going to the fuel pump? It says L/Y and B/Y, I think it should say L/B and B. And the female connector on the sidestand switch says L/Y and B/Y and it should say L/Y and B