That does not seem to make sense and leads to many questions.
Why are the changes not just made directly to the table? Why are these changes logged first and then the change is made via this script? What problem does this solve?
The script makes no effort to control what found set is present on the "WeeklyBTCustomReport" layout. Thus records could be in the table but not in the current found set and then they would be ignored by this script. And when this script is run again, the changes would be performed a second time if they are still in the current found set for this layout.
So it seems you need either a Go To Related Records, scripted Find or perhaps a show all records to make sure that all records are processed and I'd think that you then want to at least set a value in the field to "mark" it as processed so that your script can avoid making the same change all over again.
And I can't get my head around the purpose behind your If steps that check "If Field ..." values against "Equals Data 1" and "Equals Data 2". Especially since the set field by name steps are identical in both cases.
And please note that
GetField could be used in place of Evaluate to indirectly reference your fields.
If you rename the "WeeklyBTCustomReport" table occurrence, this script will fail to work due to the quoted text used inside the Evaluate. IF you set a variable to Get ( LayoutTableName ) and used it in place of the quoted text, you could modify this method so that renaming a table occurrence can't break it.