You could get rid of the cursor here too. Something like this should be pretty close.
DECLARE @CORRECTION_STATEMENT nvarchar(max)
select @CORRECTION_STATEMENT = 'UPDATE [janinetestdata].[dbo].[EDTE] set ' + Columns_To_Fix + ' = '''
+ Corrected_Value + ''' WHERE zBarcode = ' + zBarcode + ' and '
+ 'PERSON_NUMBER = ' + Person_No + ';'
from [janinetestdata].[dbo].[TEST66]
where Command = 'UPDATE'
and Person_No is not null
and Columns_To_Fix is not null
and zBarcode is not null
exec sp_executesql @CORRECTION_STATEMENT
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