How to *hide* (prevent Windows from installing) the particular updates with Powershell. https://qiita.com/MaySoMusician/items/f239197283f4a8ad9811

how-to-hide-the-particular-windows-update-program-with-powershell.ps1

#Requires -RunAsAdministrator
# Must run this as an administrator!
# Based on the official wushowhide.diagcab

$target = "2021-03 Cumulative Update for Windows 10 Version 20H2 for x64-based Systems (KB5000802)"

Write-Host ""
Write-Host "This program will *hide* (prevent Windows from installing) the following update"
Write-Host "  - '$target'."
Write-Host ""
Write-Host -NoNewLine "Are you sure you want to proceed? (y/N) "
$confirm = [System.Console]::ReadKey()
Write-Host ""

if ($confirm.Key -ne "Y") {
  Write-Host ""
  Write-Host Operation cancelled.
  exit 1
}

Write-Host ""
Write-Host "Operation started."
Write-Host ""
Write-Host "Searching the update..."

$session = New-Object -ComObject Microsoft.Update.Session
$searcher = $session.CreateUpdateSearcher()
$updates = $searcher.Search("IsInstalled=0").Updates
$run = $false

foreach($update in $updates){
  if ($update.Title -eq $target){
    Write-Verbose "Attempting to hide $(($update).Title)"
    $update.IsHidden = $true
    Write-Verbose "Set IsHidden to '$($update).IsHidden)'"
    $run = $true
  }
}

Write-Host ""

if ($run) {
  Write-Host "Operation finished successfully."
} else {
  Write-Host "FAILED: update not found"
  exit 2
}