But thought burnishing/cleaning up the hole was
SOP even if the hole looked smooth and almost perfect.

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Normally, reaming is the final step in preparing a hole to accept a fastener.
Any chamfering is done prior to the final reaming.

Assuming there are no visually apparent flaws, with parallel-sided holes the
quality of any hole is relative to the fit of the fastener. There are four
general catagories of fit: Free, light press, driven, and shrunk.

'Burnishing' has several interpretations with regard to holes and varies
according to the application. At one time it was common practice to knurl an
oversized hole then swage it back to spec using a hardened dowel. But such
practices are not used in aircraft.

-R.S.Hoover