ENT in a high rise? <sacastistic> Sorry...
Oh.... anyway, welcome to the forum Rannon!
And yep, I too would question the fire blocking method.
ENT isn't allowed where I'm at, and barely available for use in neighboring cities, but the way I read the code for use is over 3 stories, (Wow that sounds familiar) it's only allowed within certain finishes of comprised fire rating. And the oddest exception of allowed to be exposed if the building has sprinklers...? I assume these will all be covered, but (Like you said,) I don't think the method used would be rated for it.
The best resource for that would be the manufacturer of the material used in the fire proofing, to see what they have thier products listed for, and how it would be put together.
To understand my sarcasism see this recent post about NM in high rise; https://www.electrical-contractor.net/ubb/Forum2/HTML/002098.html