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I don't know if this thread is still active or not. I looked it up while trying to find additional clarification about undetectable quality myself. In my campaign I have a ninja and a summoner that use this particular ability to great effect.
I discussed this ability with both the player that has the ninja and another GM of more experience than myself. We arrived at what I believe to be a good ruling for the ability.
Undetectable does in fact prevent detection by any magical or mundane means. This would include divination, see invisibility, true seeing, tremersense, blindsense, blindsight, etc. It does not however, prevent its removal such as with purge, dust of appearance, fairy fire. If the undetectable character attacks an enemy with melee then the enemy will know the square the invisible attacker was in at the time of the attack. with ranged attacks the direction would be revealed and possible the square as the ranged attack is not invisible once separated from the invisible person. So there are ways to hard counter (such as dispel, purge, etc.) and ways to find the invisible person's location if they are interacting with the environment.
This of course still allows such characters to be perfect scouts and ignore attacks of opportunities.
As for always being able to keep up invisibility using mythic power points. This can be countered by throwing more encounters at the party in a shorter amount of time. The players will eventually get a mythic boon that lets them restore their nonmythic powers by spending a mythic power point. A limited time mechanic can be built into the campaign to provide stress and a need to keep pushing. This will force the pcs to use their mythic power points for these refreshes.
Also remember AoEs are not limited to Ref. Use cloud kill, confusion and similar AoEs to affect the party. Almost every character will be weak in one of the saves. Just use a variety of attacks to challenge each pc.
Another option would be to have the enemies realize they are outmatched and have them retreat and prepare for another encounter, this time taking into account that there are invisible members of the party. This would be especially true of intelligent enemies. Also enemies with Int of 24 and greater would likely have thought on the capabilities of the party before encountering them. It would be within the rights of the GM to use a little metagaming to prepare such intelligent creatures accordingly.
It is necessary to note that these methods should not be used in excess as the pcs should feel that their choice of character is valid and powerful but they should still feel occassionally that they are not untouchable. As such my goal as a GM for any difficult encounter is not to wipe the pcs but to challenge their characters. Their should be a hefty amount of damage and maybe some incapacitation involved but in the end they should prevail and feel they earned success with real effort.
Anyway that is my two cents on undetectable. Very powerful but still useable in the game.