If it is possible to cut a word out, always cut it out.
Orwell could have just said "Avoid wordiness" or "Be pithy." Instead, he opted for a longer version, a periphrasis. 16 syllables instead of my three or five. The shorter versions would be "possible," but maybe not desirable. I am a concise writer, but not every idea should be expressed in the most compressed, aphoristic mode. After all, with a maxim or proverb we often have to gloss or explain further.
For my taste, Orwell's essay is itself written in a verbose style. I'm not trying to play "gotcha' or "tu quoque" here, but simply to point out that pithiness is a relative judgment.