It means that you should not be showy, bold, obvious, arrogant. You shoudl not imply you are better than others (high).
It's basic premise seems to be take an analogue for what you want to be, then try to look not like what you want to be, but like the analogue.
Big cats run fast, so to run fast look like a cat. ?
No, even that is too directly ralated.
Need an analogue.
Run like the wind. So if you want to run fast, look like wind.
.Might be arguable.
It might be argued that the authour mistakes vivid metaphore for causal reason.
The inaccurate reasoning, does not necessarily invalidate the direction.