All you know is a few posters about the mount and a video that gives no information except clarifying that the champ is a yordle. Why on earth are you making assumptions to the natures of the pair? If you remember, the poster had the mount running away and being called cowardly at a "large river battle", then had the person looking for the saddle, then suddenly the thing is beloved, the battle has a name, and the mount is called the pride of Noxus.
What I think happened is that the mount ran away during the battle, then saved the battle(for the noxus side at least) somehow. Kled, not knowing this, made his first poster. Then the command told him(possibly after accepting him into their ranks) that his mount was helpful and to recover the saddle(maybe it was supplied by Noxus?), which lead to the slightly nicer second poster(Sion, being a major weapon for the Noxian army, would have had a large chance of being there). Later, after the battle was named for the report to Noxian command(and the history books), Kled learned of the importance of his mounts actions, which lead to the last one.
Now doesn't that sound like a more concrete theory than "the design is garbage and he shits on Noxian values"(Noxian values, that's funny. They value strength. That's it. It doesn't matter how you are strong(Magic? You're good. Brute strength? Welcome aboard! Tactics? We can use you. Unable to die? TO THE FRONT LINES!), you just need to be. So far they have not been said or shown to have any other values than that.) You know nothing of Kled's design, other than he is a mounted yordle that may be affiliated to Noxus, yet you are already jumping the gun and calling it terrible? Jeez, at least wait for monday/tuesday when they reveal it!
A real Noxian would have skinned a mount as lame as that.
Did you not notice him tearing apart the soldiers in the video? And cowardice can be trained out, just look at war horses. With most normal horses you can't even approach too fast without them shying away. War horses charge straight towards enemies that are screaming at the top of their lungs. Did you think that was just an inbred trait?