Hey, I'm the author of the post (just found out someone linked it here). I've fixed the link to radare2.org now.. Can't believe I hadn't noticed that to be honest.
When I get home from work tonight I will add a short intro to r2, cheers for the feedback.
A brief introduction usually prefaced with something along the lines of "In case you're not familiar with ..." or something like that is always appreciated!
(Also, since the author is asking for feedback [even though not specifically regarding this issue] I believe OP's comment is even more appropriate and helpful.)