Mount

Private servers aren't a good source of information at all concering most things, mounts included. The level 200 is the same as the level 70 and 120 except for appearance and the stats that it gives to your speed and jump.

Evading monster attacks...I have no idea why a mount of all things would give you something like that unless they add avoidability or something. :/

Considering it says monster attacks, such as magic and not something like touch damage, I'm going to assume that it is referring to the fact that you can easily jump over magic attacks that aren't over an entire area.

I'm like 80% certain that phrase is from the KMS announcement of that mount when it came out, I have an image in my mind of the first level 200 in KMS on that mount in HHG walking through snails and not taking touch damage. I'm pretty sure that's what it's for, avoiding touch damage from ordinary monsters while on your mount.