Temporary 302 redirects are also as they sound; temporary. Here you are telling the search engines to read and use the content on the new page, but to keep checking the original URL first as it will ultimately be reestablished.
The site in question probably also has a robot.txt which tells search engines to ignore anything at “/info” or whatever.
I’ve used this method pretty much on all sites I’ve made that have user submitted content.
I have no interest in giving link juice to fools.