KB4571703 has been replaced by the September security monthly rollup.
Get-HotFix will not returne all installed KBs, this class returns only the updates supplied by Component Based Servicing (CBS). These updates are not listed in the registry. Updates supplied by Microsoft Windows Installer (MSI) or the Windows Update site are not returned by Win32_QuickFixEngineering.
For more information, you could refer to the following link:
You can use dism directly :
dism /online /get-packages
Hope above information can help you.
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