Yeh that is most definitely a bot. If you can't make out their name to report them just target the mob they are killing and you should be able to see their name on the Mobs HP bar. I've been seeing them in Central Thanalan as well on my Server.

Also if they have the Chair icon (which is the afk symbol) and are still moving and doing stuff, then its a bot considering it goes away once you move or type.