I have a hard time believing what they make is classified in any way. Maybe they signed non-disclosure agreements, but the notion of backpacking equipment being protected by a security clearance...I’m not buying it. That would mean that every employee of theirs has at least a “secret” clearance, and those aren’t exactly given out.
No one said anything was classified. But it's good opsec (operational security) to practice need to know (NTK). There are also export control concerns in that at some point depending on what they are designing it could become export controlled and putting it on the internet where a foreign citizen could see it would land you in jail.