The screenshot of the CLI clearly shows it's asking to proceed even though it's scheduled to postpone for 5 days, which is unrelated to the blocked changelog approval.
If you accept to proceed and not delay, then it will do the changelog verification at a later step and check if it's blocked or approved.
Same flow with the WebUI. If you select to bypass the postone and flash now, it will try, and fail, the changelog has not been approved.
You would need to approve the changelog, and bypass the postpone period for it to flash from the WebUI.