I can see the video and view the first three seconds or so, but after that, it throws up a login prompt.

I can see the video poster, but clicking on it opens a login popup rather than playing it. However, the thing is a link, and opening https://x.com/MaximeRivest/status/2073544461473169432/photo/... directly does play it.

You can. You just have to close 3 or 4 “please sign up” nag popups.

I can see the entire video and I don't even have an account to log into.