I highly doubt that SmartBear would go back through historical posts to update broken hyperlinks for one main reason (other than no time/money/value): older posts have a high potential to be referencing outdated solutions. A solution from 2011 would probably be implemented differently today and the original documentation would have mostly likely been updated as well - so I think the intent is to have you search for more relevant/recent solutions that link to more relevant/recent documentation.
Not to say that there aren't great solutions from years past that still solve a lot of common issues, I just think after x number of years SmartBear probably archives older posts and disables the hyperlinks so they don't have to deal with the maintenance nightmare and potentially lead clients down a wrong path.
