Does searing a steak seal in juices?

I've heard time and time and time again that searing meat will seal in the juices, but does it? To test that I weighed two steaks before and after searing one and grilling the other. Both came off when they were medium rare. Which one will be the winner?

Infrared grill used in the video:
https://amzn.to/3ScTA1T

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Видео Does searing a steak seal in juices? канала Grill Top Experience