The CNBC article is referring to a proposal to allow up to $10,000 in student loan repayment as a qualified expense per beneficiary on 529 plans. This proposal was included in the Tax Reform 2.0 draft legislation in 2018. Tax Reform 2.0 was not voted on by Congress before the end of the 2017-2018 session of Congress.
Accordingly, this proposal would need to be reintroduced in the current session of Congress to be considered. It has not yet been reintroduced.
Nevertheless, members of Congress continue to feel a lot of pressure to do something about the student loan "problem" as it is a top issue with constituents.