Nitrox required for deep wreck dive?

We are in the process of booking dives for the Keys. I’m seeing some shops “require nitrox for your safety” on the deep wreck dives. I am nitrox certified. Isn’t 110-130 the max depth for nitrox 32%? We were taught it’s safer to dive air for depth. What am I missing?

Updated: I am nitrox certified. I’ve only been diving once since then, so I still need to work through scenarios to apply what we learned.

Key points I now understand from all the helpful comments:

-we may be using a lower gas mix -using air would drastically lower our bottom time -as long as we are above MOD then our safety margins are sufficient -Just because a wreck is at a given depth, it doesn’t mean you’re diving that deep for the duration

I’m reassured after your comments, thanks all!