Sun Disk passive should it do this?

I thought that Azir passive would be great for stopping the enemy team from taking your inhib when you have few members to defend I am unsure if it is really suppose to act as a turret if it is shouldn't it make all structures between it and the inhibitor invincible while active? If not it should say something in the tool tip about it. Note: Right now if you used his passive on the inhib turret you can still kill the inhibitor while it is up.
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