Your average places like the auto parts store and whatnot won't usually touch a slotted, dimpled or drilled rotor, too much liability.
Any machine shop with a lathe large enough (or a rotor lathe, more specifically) CAN give it a shot.
The groves DE's referring to are on the outside edge that mess up the more "automated" turning processes, basically the bit will bite in too hard because of the notch in the corner of the rotor. Any real machine shop would laugh at that groove and proceed with the resurfacing, though.
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