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I only see Midnight Silver Metallic, not the original silver color. This may be what OP is referring to, in which case this has been an optional color all along.
The color you see is called “Midnight Silver Metallic” and is a color that has always been available for the Model 3, and has been available for several years for the S/X.
In an attempt to prevent TMC members from suffering deep mental anguish, yesterday I updated the thread title to make clear that the lighter silver paint color is not the color the OP “found”.