No. The Ancient Traxxyr is a special landmark unit, but is not a hero or minion. It attacks and can be attacked (in which case it retaliates). It will not be attacked by spires, since it does not activate within a turn. It is opposing to all faction units.
It cannot be affected by talents/advancements that specify they are used on landmark minions/faction units/minions/heroes, such as Pacify, Possess, Recruiter, Stasis, and Yrtel's Will.
It can be damaged/affected by talents/advancements that specify they are used on units, such as Entropy, Glidebomb, Impale, Incorporeal, Quick Counter, Self Destruct, Source Aura, Splash, Toxic Secretion, Unstable Rift, and Wallop.