Mythic Exemplar of Sunyartra: 12-20 Critical Threat?

[RTGoodman]

Um, that's pretty much the exact opposite of how the rules work.

You automatically hit on any critical threat. What this does is mean you hit on 12-20, no matter what their AC is.

Nope.

Critical Hits

When you make an attack roll and get a natural 20 (the d20 shows 20), you hit regardless of your target’s Armor Class, and you have scored a threat. The hit might be a critical hit (or "crit"). To find out if it’s a critical hit, you immediately make a critical roll—another attack roll with all the same modifiers as the attack roll you just made. If the critical roll also results in a hit against the target’s AC, your original hit is a critical hit. (The critical roll just needs to hit to give you a crit. It doesn’t need to come up 20 again.) If the critical roll is a miss, then your hit is just a regular hit.

Increased Threat Range
Sometimes your threat range is greater than 20. That is, you can score a threat on a lower number. In such cases, a roll of lower than 20 is not an automatic hit. Any attack roll that doesn’t result in a hit is not a threat.

A critical threat is NOT an automatic hit - only a natural 20 is. Everything I've seen in 3.5 says the same (PHB, SRD, Rules Compendium, etc.).