The point of (d) is to create a jurisdictional hook for the US federal government. The federal government only has power over a limited number of offenses, including "interstate commerce" related offenses, but not most normal criminal offenses, which can only be criminalized by the states. So, for the federal government to regulate it, the easiest way is to only regulate things that involve interstate commerce somehow. In this case, downloading the Stable Diffusion model over the Internet probably creates enough of a hook, and this defendant is alleged to have done much more than that, so it's probably enough.
The point of (d) is to create a jurisdictional hook for the US federal government. The federal government only has power over a limited number of offenses, including "interstate commerce" related offenses, but not most normal criminal offenses, which can only be criminalized by the states. So, for the federal government to regulate it, the easiest way is to only regulate things that involve interstate commerce somehow. In this case, downloading the Stable Diffusion model over the Internet probably creates enough of a hook, and this defendant is alleged to have done much more than that, so it's probably enough.