Update-AppxPackage....where is it?

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This isn’t something I’ve had to do so I’m approaching this objectively from a PowerShell perspective.
AppX is a binary module available only in Windows PowerShell.
The article you linked to appears to be an AI generated website so I suspect that the AI hallucinated the Update-AppxPackage cmdlet as it truly does not exist.

get-command -Module Appx | Where-Object {$_.Name -match 'update'}

CommandType     Name                                               Version    Source
-----------     ----                                               -------    ------
Alias           Get-AppPackageAutoUpdateSettings                   2.0.1.0    appx
Alias           Remove-AppPackageAutoUpdateSettings                2.0.1.0    appx
Alias           Set-AppPackageAutoUpdateSettings                   2.0.1.0    appx
Cmdlet          Get-AppxPackageAutoUpdateSettings                  2.0.1.0    appx
Cmdlet          Remove-AppxPackageAutoUpdateSettings               2.0.1.0    appx
Cmdlet          Set-AppxPackageAutoUpdateSettings                  2.0.1.0    appx

Just another example of AI leading people astray. A quick search of the internet is not revealing a lot of options for directly updating Windows Store apps via PowerShell.
There’s some references about using WMI, and another one that talks about starting the ‘ms-appx://’ process with arguments, but I’m not seeing PowerShell cmdlets directly related to it.