Didn't go through the entire article, but did notice they used a hose.
At the shop we clean bikes all day long, and we never use a hose. And we see some pretty dirty bikes. Of course we have a solvent tank for the crusty bits (cassettes, chains ect) but I tell people to try not to use a hose.
We've had more than a few bikes in with cables rusted, and bearings messed up from the backyard hose. The only thing I would hose off, and would be careful about it is the chain.
It's funny, some people think they are doing us a favor by hosing off the bike before they bring it in. But it's kind of gross to find stuff dripping out of the bike frame- and not know what it is??