Not sure what they mean by their use of "safely and securely". If they mean that processes are not isolated from one another completely, sure. They aren't. That's something cgroups that solves.
However, the system permissions model and networking stack absolutely allowed multiple services to be served from a single host securely. VMs provide a far lower level of isolation though, while still not perfect. See: virtual machine escapes.
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Not sure what they mean by their use of "safely and securely". If they mean that processes are not isolated from one another completely, sure. They aren't. That's something cgroups that solves.
However, the system permissions model and networking stack absolutely allowed multiple services to be served from a single host securely. VMs provide a far lower level of isolation though, while still not perfect. See: virtual machine escapes.