I belive that. For example, Amazon is selling "DOT approved" H11 LED headlights with good reviews. One problem is that they blind oncoming drivers (I know because I bought them and tried). The other problem is that DOT does not approve headlights, and FMVSS-108 says H11 is halogen, so this clearly violates 49 U.S. Code § 30112.

I asked the seller and they did not respond, but when I tried to write a review Amazon would not let me: "Sorry, we are unable to accept your review. You are no longer permitted to review products on Amazon because you have violated our Community Guidelines." I called Amazon and they said the'll investigate and get back to me, but never did.