In an existing world converted to 1.8, in hardcore mode, I approach an underwater temple. I drink a potion of invisibility and toss away the glass bottle. I have no other gear, and am wearing no armor.
Upon approaching the underwater temple the Elder Guardian still inflicts mining fatigue, but regular guardians still ignore me.
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But the Wiki also states:
--> Elder Guardians' eyes will still follow a completely unarmored player under the effects of a Potion of Invisibility, but this is entirely visual and they won't attack them.
So I assume that being invisible would allow the character to approach the underwater temple.
Since it is an AOE "attack" requiring no unobstructed line of sight, I'd assume that this is working as intended. If anything, the wiki should state this in a clearer way.
http://minecraft.gamepedia.com/Elder_Guardian#Behavior