Solved...
I changed the permission for
Get email notification of submissions
mod/quiz:emailnotifysubmission
from "Allow" to "Not Set" on the system role for Course Creator. I then went to the specific course and set an override for the Teacher for the same permission to "Allow". Now only the teacher for that course will receive the email rather than the individuals for the system roles.
Nothing further.
Face-to-face (plugin)
Quiz Completion Notifications
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