I think you could actually use the formula to your advantage such that looping the resulting values is not required... you can use SpecialCells to highlight cells containing Formulae and then subsequently differentiate further based on the resulting values of said formulae (ie Text, Numbers) ... so if you set the formula up such that it returns say a number for a valid result and a text value for those to be deleted you can use SpeicalCells to identify those to be deleted, eg:
Note in the above any row within the range that does not contain values for A & B is excluded from deletion... you can obviously alter the formula to suit your own needs.
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