Also, perhaps I've just been miraculously lucky (or it's a Miyota-only issue), but his comment re Automatics rarely generating enough power reserve without winding sounds like complete bobbins as well. I have owned multiple Automatics of various makes, and never wind them manually (worry it'll unduly stress the mechanism, on ETAs especially), just shaking gently to start them off, and have never had one power down on me yet (provided they were worn daily at least for a few hours). This is despite working a 9-5 desk job.
I thought the same thing. I believe he is hoping that Osain didn't know much about watches and trying to pull the wool over his eyes. I also work a desk job, and have worn automatics for months at a time without them ever running out of power. Everything I've read indicates that while wearing an automatic watch, even on an fairly inactive person, there will be enough power generated through movement that it should have a nearly 100% full power reserve at all times. This is why some people will claim that all things being equal, an automatic watch will be slightly more accurate than a handwound. Isochronism is much less of a worry when you're always at the same power level.
To say that "Very few people develop sufficient power reserve to keep a watch running indefinitely by automatic winding alone" is a load of BS. Additionally, there are claims that some automatic movements can be prone to premature wear by handwinding them.