Max Masnick is using Text Expander to quickly enter defer and due dates in OmniFocus. Max primarily uses this for events that have the same defer and due dates. For example if you want a task to disappear but show up as due on Monday at 9am. I don't have much cause for that style task because I so rarely use due dates but there is no reason you couldn't also use this to defer with later relative due dates, for example two weeks from Friday, which in OmniFocus speak would be 2w Fri. Moreover, Max figured out how to combine defer dates and TextExpander so of course he gets a link.