Try this

.github/workflows/cs.yml

@@ -91,7 +91,7 @@ jobs:
       # The results of this CS check will be shown inline in the PR via the CS2PR tool.
       # @link https://github.com/staabm/annotate-pull-request-from-checkstyle/
       - name: Check PHP code style for the changes made in the branch only
-        if: ${{ failure() && steps.thresholds.outputs.EXITCODE == 128 }}
+        if: ${{ failure() && steps.thresholds.outputs.EXITCODE != 128 }}
         id: phpcs
         run: composer check-branch-cs -- ${{ steps.base_branch.outputs.REF }}