Yes, I got your view earlier. But then again - it’s a pretty big country. And from my limited experience I had ostrich meat at HaiDiLao a couple of times and bought dried ostrich meat at Urumuqi. So, at least in same areas (probably close to the farms, so up north) it seems not too rare ...
For the farm size I can’t help much: in 1997, average farm size seemed to be ~200 birds. I would assume, in the last 20 years there has been some intensifying in farming efforts, so it might be larger now ...
And before I start to browse the trade statistics, better back to the egg topic 😉