That section of law says they can sell your data with prior written or electronic permission.

47 U.S. Code § 551 (c)(1)

Except as provided in paragraph (2), a cable operator shall not disclose personally identifiable information concerning any subscriber without the prior written or electronic consent of the subscriber concerned

So this section of the law, though another might, does not support your statement that "that they could sell that (which is false)".