Those tool marks are just that, formed when the reamer cut the chamber and the bullet lead (throat) all in one pass. Done on CNC machinery with reamers that are used a certain number of times before being resharpened, and then tossed after so many resharpenings (or so that's the way it's supposed to go).
Factorys & piece-work being what they are, that doesn't always happen that way though.

Tool marks themselves are just the result of the machining process used to cut or form the metal in the way you wish to. The higher polished the cutting edge on the tool, the better the finish on the part. A mirror finish can be machined into a part if needed.

Deep tool marks can occur from a poorly sharpened/dull reamer, metal chips stuck to the reamer scoring the surface as it cuts, and poor lubrication of the process as it's being done.

Wrong feed & speed for the matr'l will also induce them but that's all supposed to be worked out on modern equipment. We're not talking hand work chambering jobs here on a Clausing.

Any after polish of the chamber is little to none. A quick burnishing is all that's done to slick up the surfaces and remove any micro burrs clinging to the surfaces. These aren't Bowen Classics they built.
That's about all that's done in production line work.

Where those tool marks are is where the bullet of a loaded cartridge sets,, in the throat.
They'll never interfere with the extraction of a fired case as the bullet is long gone and the case itself never enters that area.

That forward area can be too large in dia many times effecting accuracy, or even too small, but it won't have much to do with the extraction of a fired caseing.