> the counterargument is that separating the two commands gives an opportunity to link to both the Django and the South docs

I used to think more this way (I generally like being very explicit), but have changed my view on how much of the underlying implementation should be exposed to end users. It's hard to learn something new and as complex as Harvest and introducing additional terms that require the user to lookup in order to understand what they are only detracts from the flow and purpose of the article.