At least the USA and our allies are extremely conservative in adoption of unproven tech and have extremely high standards for security. The article states "mode

At least the USA and our allies are extremely conservative in adoption of unproven tech and have extremely high standards for security. The article states "modern methods are not safe" and is correct, in my experience. Numbers stations and One-Time Pads are a well-known and proven method, not just the encryption, but the entire process from delivering the pads to receiving the messages.