Belt Brace

Redundancy ensures meaning is not misunderstood - what does that mean in the following below?

In the above you can see that for the subject it is purely the ordering of the elements (with some flexibility), and for the object in the above cases it is the ordering together with the word ‘to’: we don’t say ‘Bill said Bill’ but ‘Bill said to Bill’ – belt (w.o.) and braces (preposition ‘to’). Useful. "Redundancy ensures meaning is not misunderstood, that trousers don’t fall down."

Ah, redundancy.

The reason there is redundancy in writing is for the sake of clarity.

In good writing, we usually delete extra (repeated) words. However there is an exception, especially in academic writing. This means that when being concise sacrifices meaning, it is better to be redundant (i.e. add repetitive words) so that your meaning can be understood.

Redundancy is the act of wearing both a belt and suspenders. In other words, if you are of a body type that you wear a belt and the pants may fall, or if you wear suspenders, and your pants may fall, if you really want to be certain your pants stay up, wear both.

It is a safety factor. It is the kind of safety factor that is frequently practiced in a business environment--overlapping of jobs so that several people make certain a job is done a certain way, or proofread, or correct, or whatever element needs second-checking.

In terms of writing, redundancy is used exclusively to create clarity.

The author said he is correct.

(Does "he" refer to the author or to someone else? Redundancy would make it clear what "he" is referring to.)

This explains the issue you ask about. However, the paragraph is badly written up to the quote, "Redundancy ensures meaning is not misunderstood, that trousers don’t fall down."