What is it you think the "metal" is in in the phrase "running on bare metal?"
Your comment is irrelevant. Who cares in what directory or disk image the packages are installed? If I run in a "chroot jail" am I not "running on bare metal?" What if I include a library in /opt/application/lib? Does it matter if the binaries are on an NFS share? This is all irrelevant.
The phrase means to be not running in any emulation. To answer my question above - the "metal" is the CPU (edit: and other hardware).
edit2: I mean - it's the defining characteristic of containers that they execute on bare metal unlike VMs and (arguably - I won't get into it) hypervisors. There is no hardware abstraction at all. They just run natively.