Great! You can do the test yourself: pick a few quotes from those old posts and try to find them with a google search.

I found (possibly) this guy's blog by googling 'passthejoe blog'. I don't think it was the Blogger blog they were talking about, though so I made another search with (presumably) their real name and word blog. Bang,there it is. Picked one post from 2011 and searched its opening line "I’m no Backports guru, though I’d like to become one" (with quotes). The post came up as the second search result.

The question is do the posts come up for searches around the topic their cover, not that the domain is discoverable.