docs to Get-Moduleindicate:
Starting with Windows PowerShell 3.0, the core commands that are included with Windows PowerShell are packaged in modules. The exception is Microsoft.PowerShell.Core, which is a snap-in (PSSnapin) . By default, only the Microsoft.PowerShell.Core snap-in is added to the session. Modules are imported automatically the first time you use them, and you can use the Import-Module cmdlet to import them.
(emphasis mine)
If you run Get-PSSnapin, you will really see:
PS C: \ Users \ JamesThorpe> get-pssnapin
Name: Microsoft.PowerShell.Core
PSVersion: 5.1.15063.502
Description: This Windows PowerShell snap-in contains cmdlets used to manage components of Windows PowerShell.
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