A third-party site show that the hundun from Bestiary 5 has Befuddling Strike as a feat, and befuddling strike is listed under Special Attacks with a number of uses per day similar to how Punishing Kick is listed. Its Unarmed Strikes ability explains that the ability grants the hundun the befuddling strike rogue talent.
The text for Befuddling Strike is as follows:
When the rogue deals sneak attack damage against an opponent, that opponent takes a –2 penalty on attack rolls against the rogue for 1d4 rounds.
Does a regular ol' hundun have any means of dealing sneak attack damage, or was this a mistake?
Argh to abilities with the same name. Especially since the PRD's bestiary entry still has this text:
Unarmed Strikes (Ex) A hundun's unarmed strikes deal 4d8 points of damage, and function as chaotic, magic, and adamantine weapons for the purpose of overcoming damage reduction. A hundun can make a flurry of blows attack with its unarmed strikes as a 20th-level monk, without increasing its base attack bonus or taking the -2 penalty on attack rolls. This ability also grants the hundun the Befuddling Strike rogue talent and the Punishing Kick hungry ghost monk class feature.
But at least now we know how the thing is supposed to work. Thanks!