This plugin has not been updated by its developer since a long time ago.
It could imply partial or total lack of compatibility with the latest versions of b2evolution.
Imagine you publish a post, ping blog pinging services, send trackbacks and then, you discover you misspelled a word in the URL! You've got the choice to either do nothing and leave that ugly error on your blog, or to fix the URL, with the lost of all the visitors coming to the previous, erroneous, obsolete and now blank page. Post Redirect Hack makes possible to easily redirect visitors from a b2evolution blog post to another post or even any URL without the use of a complicated and not always available .htaccess file!