Arian,
If a user is assigned a Business role and you want to EDIT his access, you will have to Edit the Business role - which would update access of all users who are assigned that specific business role.
The other option is to EDIT the user access 'Without Business Role', this will remove the Business role for that user and he would have access/restrictions independent of the business role.
If this is just one-off user, best way would be to EDIT his access 'Without Business Role' and the rule that you showed shall be the correct role provided you have set up the Territory management correctly in the system.
BR
Ankur