I don't believe those are chatter marks, as multiple knives have the same pattern in the same place. It also does not look like any chattering tool marks I have ever saw in the tool room at work. More than likely in the CNC program.
when machining tools start to dull they chatter/deflect. This blade just happened to be the one the tool dulled out on maybe. The tool was probably changed after this blade was complete with a sharp tool and this would maybe have solved this blemish. It also depends on how consistant heat treat is, this blade could of came from a batch that is a tad bit harder than other blades. This is all part of the comp finish (rugged non polished look imo), and the reason Busse doesn't like to offer it is because people are freaked out by this at times. It is what it is, this would normally be polished out and you would never know. This blade defines competition finish to me and looks great (great look behind a sharp edge)!