First, This is about RHEL 8 (Beta) not 7, 6, etc. Second `#!/usr/bin/python` is a different animal than `#!/usr/bin/env python`. One is hard coded. The other is `PATH` based so will change depending on current `PATH`.
On RHEL 7 (and earlier) `/usr/bin/python` must be the Python 2 the system shipped with or your break `yum` and other admin tools. When people try to install their own python by doing a `make install` as root, `yum` breaks and it's hard to recover the system.
What the article is saying is that RHEL 8 addresses this by having a platform python that the system tools use. So RHEL 8 tools will not use /usr/bin/python
On RHEL 7 (and earlier) `/usr/bin/python` must be the Python 2 the system shipped with or your break `yum` and other admin tools. When people try to install their own python by doing a `make install` as root, `yum` breaks and it's hard to recover the system.
What the article is saying is that RHEL 8 addresses this by having a platform python that the system tools use. So RHEL 8 tools will not use /usr/bin/python