Yes, and weight weenies is also populated by a lot of wishful thinking and inaccurate scales. I know, I'm a big contributor to that site, being a nutcase that measures everything. Not that I am suggesting that the MFGRs are accurate however.

Surprising to me is the fact that the numbers you posted are actually less than what the CC calculator has. I have never encountered a single item, Campy or Shimano, that weighed less than the MFGRs published weight.