Why Imrazor the Numenorean?

[Zigûr]

Originally Posted by William Cloud Hicklin

Oddly, that would seem to align him symbolically with the King's Men, not the Faithful.

I suppose it might be comparable to the Men of Gondor building the monument in Umbar to Ar-Pharazôn's humbling of Sauron despite Pharazôn being the leader of the King's Men. If they were fine with that then perhaps using their old language was fine regardless of its historical political and spiritual connotations.