Do they really recommend 302 for cheating purposes?
In the past that way was used often by shady
SEO's to steal
PR of linked external domains, under certain conditions, which caused a lot of angriness in the web world.
Even if you can't steal it anymore, in this way you don't say "I am not sure about this link, I don't want to vouch for it", instead you say "It's all mine, just give me the
PR", which is clearly misleading.
That may have some sense for internal linking, but it is still cheating. You even don't know what you send to your chosen page.