[InitialLastName]

The article doesn't actually say he was arrested for being the developer of Tornado Cash. It might be trying to imply that (or offer an explanation of what the connection is between the arrest and the investigation into Tornado Cash). All the article asserts is that he is suspected to be the developer of Tornado Cash, and that he was arrested "[under suspicion] of involvement in concealing criminal financial flows and facilitating money laundering" via Tornado Cash. That could (and likely does) mean that he was involved in far more than just development.