If you drew a straight line where the V cut was made, you will see that the cable clamp around the ARO arm collar is actually clear of an uncut brace, but only just.
As John explained, Greenstreet made the pivot to spindle distance 212.5mm based on their understanding from Naim that that's the correct number. Others have shown this to be slightly wrong, but 212.5mm is still within the 211 +/- 1.5mm spec. I'm happy with the increased distance as the Lyra carts I favour tend to have 8.5-9.5mm mounting distances to stylus tip. I certainly detected no audible tracking distortion with my Lyra Clavis DC.
When it's all said and done, I'm getting a MASSIVE improvement from the GS that make it the best thousand bucks (NZD) I have ever spent on hifi.