I think you might be wrong

"This isolation mechanism will be available both on the Secure Element of Ledger Blue and its non secure MCU, with an Open Source implementation provided for the non secure MCU as we would like to encourage new designs to use ARM MCUs leveraging those protection mechanisms (such as the STM32L0 line from ST Microelectronics)"

"MALWARE PROOF
Even on a compromised computer, you can initialize your Nano S and confirm each transaction on the built-in display, protecting your assets against malware, theft or viruses."