There's nothing wrong with CNC for that type of product, and it is necessary as well. Many of the higher-end products in that market use nearly 100% CNC, whereas lower-end mix casting and CNC.

I'm not sure the quoted statement is fully correct, CNC and Casting are processes and each have advantages as well as capabilities the other cannot easily replicate. (Try casting threaded holes -- there are ways to add threading to a casting process, but it's not the same.)

I think the original quote intended to convey the following idea, instead of never CNC: if you have a high-volume product, while CNC machining can effectively handle shaping operations, casting will be less expensive for shaping in the long run, leaving CNC to more difficult to cast operations and final product fit.

In the camera market, there are tons of companies selling equipment in thousands and tens of thousands of units that are fully-CNC'ed and no casting. (See Kessler, Dynamic Perception, CamBLOCK, etc.)