I don't think you're being fair calling it a "moving goalpost". The "organic movement", if that's even a thing, is about a lot of things to lots of different people. It's about supporting local economies, safety and jobs for field workers, a reaction to the decline of rural culture and the rise of agribusiness, getting more fruits and vegetables and less corn byproducts into children, etc. It's also a movement with a long history and lots of different players pushing different agendas, co-opting a single word to relay their message.

It's like reading an article in Wired called "The Rise of the Geeks" or "Silicon Valley Rebels" depending on the time and context it could mean 1,000 different things.

When someone says "organic" they could mean "organic" in the sense the USDA means it, or the could mean: biodynamic, local, home grown, etc.