Caestus Assault Ram rules goof?

[Dezmo1218]

Searched for previous threads, but didn't see anything.  Checked FAQ, nothing.

 

So I'm seeing a goofy useless rule for the Caestus Ram (FW Index, Adeptus Astartes):

 

Caestus Ram / Melee / Str User / AP -3 / D6 Damage 
Add 3 to all hit rolls made with this weapon when targeting BUILDINGS if the Caestus Assault Ram charged this turn.

 

...which is fine, until you consider the following Special Rule for the unit itself:

 

Airborne Ram
This model can only declare charges in the Charge phase against units that can FLY, and may only attack or be attacked in the Fight phase by units that can FLY.

 

I'm assuming that this was overlooked, as the Airborne Ram rule makes sure that you aren't charging (or being charged by) any units that don't have the FLY keyword.  

Do any buildings even have FLY?   Or am I missing something important here?

Edited December 29, 2017 by Dezmo1218

[Kallas]

Look at all of its rules: it has Hover Jet, which removes the Hard to Hit/Airborne Ram rules, allowing it to charge (and be charged by) non-Fly models.