Even if some people are cartoonish, I imagine if I ever became head of a totalitarian regime I would somehow see to it that I didn't surround my government with George Orwell references.
Depends how relevant Orwell in the B5's 23rd century. Since nobody ever made the connection on screen (and the characters had the "umm yeah, stupid/interesting name" reaction at best), I think only the few people interested in 20th century literature and history know any details of his work. The general public (Clark and his cronies included) being ignorant on the matter. Out of universe it's big neon warning sign, but only because Orwell's work is still influental part of western culture.
And even as a purely practical concern, the Centauri, a long-term trading partner of the EA is menacing the LONAW, another long-term trading partner and their allies in the Dilgar war. Plus the Centauri have conquered and are brutalizing the Narn, the only ones to help Earth in the Minbari war, granted they profitted greatly from it. Why is Clark's regime supporting the Centauri here?
The LONAW is a loose federation of minor and insignificant powers and you can trade with them even when they are under Centauriopression
protection. The Narn were as supportive to EA as your average black market weapons merchant. Your PR department can paint them as one. Meanwhile the Centauri is one of the biggest and meanest kid in the block, you don't want to mess with.