I’ve seen that page.
If you notice, one person says root/nopassword worked and another person says admin/ zmodo19820816 worked.
The person posting was using a really old version of the camera, specifically, the version that they were on had a completely unsecured video port. It was a BIG security issue for those devices, which is why they ultimately pushed a forced update to resolve the security hole. On the version that they were using, you could have entered any password, or no password on port 8000, and you would have gotten access to the video stream data.
Notice that the person who updated to the V220.127.116.11 couldn’t get it to work, because that version has a secured 8000 port.