There is no evidence given that North Korea did this.

"TRM attributes this attack to TraderTraitor, North Korea’s premier hacking unit. We base this assessment on robust on and off-chain intelligence sources. The FBI named the same group as responsible for the USD 1.5 billion Bybit hack in February 2025. Several features of this attack match earlier North Korea-linked heists, including the Bybit hack and the KelpDAO hack in April 2026: small Tornado Cash withdrawals funding an operator wallet, staging that began well before the theft, and signatures obtained in advance then executed in one burst. The laundering observed so far, built on large swaps through market makers and lending protocols, differs from the bridge-heavy pattern that followed Bybit. TRM will share further findings as the investigation develops."

https://www.trmlabs.com/resources/blog/north-korea-steals-us...

This is simply an assertion that an official enemy did something we don't like. It could just as well be a CIA money laundering scheme. This would make more sense, given the wider deployment of US cyber weapons and assets as well as the desire of North Korea not to provoke American aggression which previously murdered about 20% of their population.

It is widely known America has cyberweapons deployed around the globe. It is likely trivial for them to fake a trail of evidence from the DPRK.