Forum:Earthbound Immortals and Guardian Kay'est

I looked at the rulings for the Earthbound Immortals and it says

"If you control an Earthbound Immortal and no other monsters, your opponent cannot attack you, because they cannot select the Earthbound Immortal as an attack target. (Exception: they can attack with monsters that can attack directly, such as “Submarineroid.”)[1] "

Clearly if the Earthbound Immortal is the only monster on your feild, since it can not be targeted as an attack target, the opponent can not attack you directly except with an effect.

Why then, does the ruling for Guardian Kay'est, which has the exact same effect (can not be targeted as an attack target), say that if it's the only card on the field you CAN attack directly?

This does not seem fair at all, they have the same effect don't they? I was really annoyed to find the ruling on Kay'est (a long time ago), say the opponent can attack directly. One would naturally assume otherwise right?

So, is there a way I can get the ruling on kay'est overturned to be the same as the Earhhbound Immortals?