No... It just means that all features may not be available. It makes no comments on how well the existing features work and how compatible they are with the Windows version.

I mean, `Get-ComputerRestorePoint` and `Get-WmiObject` don't mean anything on Linux. I assume those won't be ported. `Get-Process` is certainly meaningful; I assume that will be. The ports might also have cmdlets not available on Windows. I could certainly see cmdlets to interact with `apt` in Ubuntu, or `yum` in RHEL. Especially since PowerShell is focused on provisioning and managing machines.