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It's her quote... she jumbled two thoughts together. The credit reason is separate from the checking piece. From later in the article:
The rule capping credit card late fees was passed by the CFPB in March, but then a coalition of bank industry groups sued to stop it before it could become law. The law is pending appeal before a judge. Trade organizations representing large banks also sued to prevent changes to the Community Reinvestment Act, which requires banks to offer their services to low-income and historically disadvantaged communities.
Even though the credit card late fee cap hasn’t become law yet, some credit-card companies are ready to pass on costs to customers. Chase has sketched out plans to ratchet up interest rates and take a more conservative approach to underwriting credit-card loans, according to an investor presentation.
So the potential tightening of credit is due to them not being allowed to have higher credit card late fees. Just means they won't be as predatory when they're giving some dude with a 550 credit score a card.