Game Mechanics: Regarding Ogres being stunned

[nilbog]

I found this on an old page:

Frontal Stun Immunity
When facing the enemy, you can’t be stunned by normal melee. However, you can still be stunned by spells with stun effects.

--==Extra Info on Stun Immunity By Ugli Itchibottom==--
Ogres can not be stunned in PvP melee. Period. Not from the front, not from behind, not even from behind with slam/bash. Most NPCs bashing can only stun them from behind. Exceptions are giant class MOBs, which includes giants of course, and cyclops, as well as sarnaks and Drolvargs in Kunark, and wurms/wyverns/dragons. Giant class mobs even get a chance to interrupt with normal hits, not just bashes. Other mobs can *ONLY* stun Ogres from behind with bash. PCs can not stun them except with spells.
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http://www.notacult.com/guide_trollshaman.html

What of this works, and what does not?

Discuss specifics of giant sized npcs stunning with normal hits.