Same reason as the MiniMax H3 T2V example: this script builds its OffloadConfig
directly rather than going through FastVideoArgs.add_cli_args, so the flag needs
its own switch here to be reachable. FastH3 is the case the flag exists for,
since its components sum past what a 121 GiB unified-memory device can hold.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>