Delete-ComputerRestorePoint.ps1 is non-functional #5

Simply doesn't work. Attempting to invoke the script like in the example:

Get-ComputerRestorePoint | Delete-ComputerRestorePoints -WhatIf

Delete-ComputerRestorePoint : The term 'Delete-ComputerRestorePoint' is not recognized as the name of a cmdlet,
function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the
path is correct and try again.
At line:1 char:1

• Delete-ComputerRestorePoint

•   + CategoryInfo          : ObjectNotFound: (Delete-ComputerRestorePoint:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException