So it appears the issue is with the way the iso was created.
Here is an answer from the Ask Ubuntu site.
Since 11.10, Ubuntu ISOs have been "hybrid", meaning that the ISO can
also be written bit-for-bit to a USB device to make it a working
Live-USB, without having to use StartUp Disk Creator, UNetBootin, etc.
Note that this "hybrid" is different from the OS X/Disk Utility
definition of "hybrid", which simply refers to an ISO readable on both
Mac (HFS+) and Windows (ISO9660).
Ubuntu's hybrid functionality is
provided by the isohybrid script in the SysLinux bootloader. It works
by encapsulating the standard ISO9660 CD filesystem within a
partition, so that it will work unmodified if written to a USB/hard
So I wasn't able to mount the iso in the way I was wanting however I did find a file extraction tool called Keka that allowed me to extract the distro iso and then browse the filesystem. Which was the next best thing.