I wouldn't advertise it as a feature at all. Separating the modem from the SoC doesn't guarantee anything. They claim that the Librem 5 is the phone that "focuses on security by design and privacy protection by default" but in reality the Neo900, with its sandboxed modem design, would be by far the better option in this category. There's so much to like about the Librem 5 but their false claims are annoying and don't inspire me with any confidence that they are competent enough to deliver.