I’m not sure where you were led astray. The URL you posted is to the latest docs which cover OH 3.0 and above right now. And those commands (e.g.
openhab:status) are the commands to use in the latest release version of openHAB (i.e. 3.0). So, given you are looking at the latest docs and those are the correct commands for the latest version of OH I don’t see where you are lead astray.
Now if you change the version from latest to 2.5 by clicking where it says “Version: latest” and choosing 2.5 from the list, you will see the docs for OH 2.5.
Notice the URL now has “v2.5” in it.
Unfortunately it doesn’t remember where you were so you need to navigate to the Runtime Commands page again.
Notice the URL has v2.5 in it and it says “Version: 2.5” in the upper right. Most importantly notice that the command are correct for 2.5, namely they start with “smarthome” instead of “openhab”. That is the correct docs for OH 2.5.
As far as I can tell, assuming that the docs are working properly and not resetting as they did for J-N-K, the main confusion was in either assuming that this didn’t change between OH 2.5 and OH 3 or not realizing that the latest version of OH is OH 3 and you need to look at a previous version of the docs for OH 2.5.
tl;dr: The page pointed to by latest even in your URL are the correct docs for the latest version of OH. OH 2.5 is no longer the latest and these are among the breaking changes between the two versions.