I think Orwell means the writer is to get rid of the excess, the fluff that fails to really communicate an idea or concept. Orwell seems to advocate simplicity. Simplicity does not dilute the author's intended message. Simplicity actually clarifies the author's meaning since it is direct and uses common English words. This type of writing is also efficient.
Readers can easily understand the content and can move along to the next task.
Since many employees in business today suffer from information overload, given the choice, most people will read a shorter document first. If a writer can communicate the information in either three or twelve pages equally well, it is to better use the more tightly written three-page version. While both documents may have equal merit, it is simply common sense to produce the document more likely to be read. Both of these suggestions uphold my concept of simplicity. Good usage in business may also depend on the targeted audience.