Or one of the members of the criminal gang ran off with all the cryptocurrency and then made a public post claiming some form of law enforcement seized the crypto.
According to the blog post, they said their payment server had been seized. The payment server must hold or have send-access to a Bitcoin wallet if it can make payments. By seizing their payment server, they also siezed the Bitcoins.
Oh, somehow failed to see your post before writing mine. The perpetrator of the "all for myself" starting the state actor claim themselves makes even more sense! Why anger your partners when you can just point a finger elsewhere?