They'll just make it a crime to run the models unless they authorize you (classifying it as a munition, like they tried to do with encryption), and if your power bill is suspicious you'll find yourself in jail.
Any company providing the models will be deemed a threat to national security.
No need to block the download.
Citizens were and are free to use the technology (cryptography and every other export-controlled item); your "power bill is suspicious, go to jail" FUD doesn't really track with history.
> Any company providing the models will be deemed a threat to national security.
Any company providing specifically-controlled models to foreigners would hypothetically be prosecuted.