I don't agree with this. Piston pin holes and pin bushings, which are made of aluminum and bronze respectively, are honed all the time to 0.0005" clearance or less using commercial honing machines (think Sunnen). Thoroughly clean them out with solvent and a brush after honing.
Dont hone with any type of abrasives the bushes will pick up any grinding paste and will wear out in a short time. They will have to be reamed to size.
"The truth is incontrovertible, malice may attack it, ignorance may deride it, but in the end; there it is." Winston Churchill