I notice that the suggestion is regarding the year in the DOB and that you have notified FAG of the error for them to correct. The system will still see that as an error until the memorial is updated. If you mark the suggestion as False, that will prevent it from showing on the suggestion report again. Other option is to add sameas=no as a parameter to the memorial template.
Otherwise, this will continue to show on the suggestion report until the date is corrected on Find a Grave.