Oops you are correct sir! I edited my post to hopefully reduce some confusion.Before everyone begins freaking out, this is NOT TRUE. You just need to press the arrow to go to the left. For some reason, it doesn't list Lux at the end of the choices, which is a weird website design issue.
Depending on trim being built, you may not even be able to put the Lux package in it (not available on all trims). Here's a screenshot from minutes ago trying to build a Badlands:
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