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It was never offered on a Model X. But I saw one person who had their Model X vandalized so badly that it required repainting the whole vehicle and they opted to change the color and get it painted that color.
Correct, titanium metallic. Had a short run (? unpopular) but was offered on both the S and X. I own a 2016 X in this color and named it "The Dustbuster" in homage to the ubiquitous 1980s beige electric appliance.
I can confirm that color is Titanium Metallic. I just purchased a used 2016 MX 90D in this color and I love it. I get so many compliments. Suits the desert landscape well here in AZ.