The Sheldon Brown article is an old article based on chains that use to use bushings, new chains are bushingless which improves the flow of lubricant to all parts of the chain, but even back in the day all of us pulled our chains off and soaked them and reoiled with no problems but the claim is that the oil couldn't get into the tight spaces of the bushings; today I no longer pull my chains off because I'm lazy so I just use a Park Cyclone chain cleaning machine.
Anywho, Sheldon revised that earlier comments with this: http://sheldonbrown.com/chains.html
I'm not sure I understand this post. Sheldon said not to soak chains, and then said it's OK?
When did bushingless chains become the norm? Bicycling Magazine advised not to soak chains at least as late as 2007.
I mentioned this caveat FWIW. I use wax; I do not use any cleaner. Just passed on the caution which I understand comes from chain manufacturers.