This looks a lot like an LED. But it’s not, right? What is it, then? It’s on both sides. I thought I saw other YouTube reviewers say the same, including the Level1Techs reviewer. I couldn’t find the timestamp, though.
Injection molding artifact?
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Airflow?
I suspect it is where a pin has held all the wiring in its proper place while the injection molding takes place. If they have a means to retract the pin before the plastic sets then it may leave a dimple like that.
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You see holes like that on certain molded plugs. I believe they’re just from alignment pins that were needed during molding.
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There is a special tool that grips either side of the plug by inserting pins and clamping down like a pair of pliers. Then the plug can be RIPPED FREE from the laptop 
…no actually it is just like @MJ1 said. 
It is from the injection molding process and just happens to look slightly decorative. 
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