Since I had to look at the HTML source to extract the link (please consider losing the #ref as another bugreport, please) the line that gets the link wrong is:
...refer to <a class="is-internal-link is-invalid-page" href="[/Product/VisionFive/Technical_Documents/JH7100_Boot_User_Guide](https://rvspace.org/Product/VisionFive/Technical_Documents/JH7100_Boot_User_Guide)">JH7100_Boot_User_Guide</a>.</p><div>
The href is missing the “/en/” part.
Hope that clears things up. Thank you for the prompt attention to such a minor thing.
While I have your attention, VisionFive Single Board Computer Quick Start Guide | RVspace presents the (awesome) Balena Etcher option only for Windows. That program is actually available for all three mainstream OSes and works the same way. You still have to decompress the file before handing to Etcher - just like on Windows - but maybe you can simplify that section a bit with this tip.