How does resetting Lati@s Roamer flags in Emerald affect Southern Island?

[3rd Gen Expert]

So I am just curious about this flag as it has a dependency. 

For the Roamer flags, I have the instructions here from a Reddit post:

1. Save in your room.
2. Optionally: Delete your S.S. Ticket
3. Uncheck Lati@s Roaming
4. Uncheck Don't spawn Norman in Brendan's/May's House
5. Move to the research tab of event flags:
6. Go to flag 0255, 0291, and 0734 and make sure all of them are unchecked
7. In the constant dropdown box go to
8. 130 change the value to the right of it to 3
9. 140 change the value to 3
10. 213 change the value to 0
11. Close out of that and go to Roamer
12. Delete all of the IVs, the PID, set the roamer to blank, and finally uncheck "Roaming (Active)"
13. Turn on game; walk downstairs to trigger event

But choosing a Lati from the TV also affects what is at Southern Island. Is it already covered by one of the above flags? What other flags are important when doing the above for Southern Island?