"This should reduce your taxes by adding the amount you already paid in Medicare taxes over and above the amount owed."
This is not likely to ever happen, unless an employer miscalculated the Medicare taxes to be withheld.
Medicare taxes are not like Social Security taxes, in that while Social Security has a "Base" (the maximum amount of wages that is used to calculate Social Security taxes), Medicare taxation goes on forever, although it changes once it hits a certain point.
The amount on line 24 of the 8959 is always a positive number, that is, an additional Medicare tax. It will never be a refund of Medicare tax already paid.
TurboTax is doing what the IRS forms wants.
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