Threshed, unthreshed, irrelevant to the concept. He grew it, he fed it to his chickens. They considered the very act of threshing to put it on the market, ignoring the basic fact that it was not actually put on the market.
I agree, but I think it is interesting that the Wickard case collapses on itself. All the rhetoric about "home consumption affects interstate commerce" is moot, in light of the law being upheld allowed home consumption.