The robots.txt will not only disallow your blog post, but if you acquired your domain from someone else, the entire previous site will also be removed. That is not something you should have a right to do, unless you also acquired full copyright to all of the previous site's revisions.
So sometimes an IA-friendly domain expires (e.g. accidentally or because its owner died), a squatter buys the domain, and the squatter points the domain at a junk-site landing server with a deny all robots.txt. The result is truly disastrous: IA removes access to the historic, IA-friendly site. Site acquirers who do this deliberately are pure evil.
