The review seems quite clear on that point, even from the line you quoted. It's protecting the hard drives, not the NAS. The electronics (including the external power supply) are not encased in the safe are -- only the drives are.
> The concept is more that one can pull the drives out, put them in another Synology NAS, and be up and running quickly after a fire.
> The concept is more that one can pull the drives out, put them in another Synology NAS, and be up and running quickly after a fire.