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gnome-shell is advertised as a compiz alternative in release note: https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/7-Beta/html-single/7.0_Release_Notes/index.html#removed-packages Does it support 3D effects like 3D cube? Does it support non-GNOME environment, e.g., KDE? IIUC, both answers are No. Therefore, I don't it can be justified as an alternative. "None" is probably more correct.
I don't 'advertised' accurately describes the content of that table. But the fact remains that compiz was a compositing window manager in rhel6, and gnome-shell is a compositing window manger in rhel7