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I'm guessing it could 3D print/CNC quite a few of its own parts?

Unlikely - seven axes is very flexible, but it can't lift more than 3Kg, I suppose a very small handheld router could allow it to do some CNC, though the precision would suffer compared to a normal CNC; by the same token, it could hold a 3D printer's extrusion nozzle, but the accuracy would be poorer than a dedicated printer. It sounds like they are hoping to drive their production line entirely with their own robots, not to manufacture all the parts needed in-house.

The key is to design it in a way that such precision isn't really necessary. It probably isn't for most of it. Some things are, and for that, it puts the part on a precision jig or whatnot, rather than relying on it's own precision.

Also, if it works the way they say it does, where it is constantly comparing what it measures against its internal model and adjusting the model (similar to how our own arms and brain works), again, precision (in the geometry of the parts) isn't so necessary.

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