They've memory-holed (i.e. deleted) their entire old blog, no? It's disappointing but I think it's a stretch to describe that as Orwellian (as the OP did). At some point they just discarded all their old content, it's not that much of a conspiracy.
If someone is deleting their posts because the facts don't align to the worldview of a religion, a political party, a corporation or some other powerful group, many people will be more concerned about that than if the posts had been deleted for more routine, functional business reasons.