It's unlikely but not inconceivable! If the run is fairly long then Monaco tied the coax into the wiring harness during construction. If that's the case then you will not be able to use it as a pull wires. There are usually other good options such as running a new cable a short distant across the roof and dropping into a new hole that does allow you to route it the rest of the way to the power supply. You may even find that by removing some ceiling fixtures you can push a rod or similar device through the foam and access the coax from the roof as well as a new route to the power supply. It can take a bit of work and some trial and error, but it's certainly doable.