The sign isn't an "instruction." It is a "for your information."
It's not ordering you to slow down on THAT road, immediately, until you see another sign saying otherwise.
What it's telling you, is that "by the way - IF you are driving IN the Villages, THEN the speed limit will be 20mph - unless you pass a sign that specifies otherwise."
In my area the speed limit is 25, except near the rec center, where the sign specifies it's 15. Most people abide by the 25MPH in our area. But most people don't slow down at the 15MPH sign, they just keep blowing past the postal station, fire dept, and rec center at 25.
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