Sounds like a twinking problem. You get what you get when you decide to play a level 10/11 twink. Blizzard won’t change the rules and requirements just for twink enthusiasts.
That you don’t agree with it doesn’t make it a bug. You can provide feedback in the General forums or in game that you’d like to see this changed. As it’s not actually bugged posting here won’t help at all.
Your current option if you want to learn the mount is to level the character.
A blue post of what is the same issue, a level 10 getting a brewfest mount, with an outdated level requirement, the blue says it likely is a bug and to report it as such.
It is quite simply an item Blizzard has forgotten to update the requirement for since making dragon riding and flying available at level 10.
A simple fix will end this issue, no need to be a contrarian and have a go at people because you are jealous they have the timereaver and you don’t.