Remember that money laundering can be attached to just any kind of supposed wrongdoing. In fact, it’s the usual trick used by state authorities to freeze accounts for whatever reason, including tax evasion, which is not a crime in many countries.
Whereas a defamatory article can claim about anything and then it will be up to︀ you to prove it false in a court, which can take months or years. Meanwhile︁ the bank (which might have been alerted - anonymously - by the author of the︂ article) will freeze the account, or, in a best case scenario, close it because of︃ “reputational risk”.