Take your test with it.
Use this site in your browsers bar…
https://www.wix.com/corvid/feature/dynamic-pages
It will load up fine and you can use it to get lots of info about dynamic pages.
However, try deleting the dynamic-pages part of the url and you get what the forum user originally had in their wix location to link…
https://www.wix.com/corvid/feature/
it won’t load up, you will get the 404 error screen.