Security is relative to certain threats. Many people worried about Chinese or Russians stealing IP will be less worried about US subversion. Likewise, for Chinese companies the open Loongson systems probably reduce risk of Western subversion. High assurance like separation kernels reduce risk against high end attackers or kernel 0-days whike mandatory controls contain app-level attacks which are max skills of many damaging attackers.

So, all or nothing is wrong way to look at INFOSEC. I mean, if it's nation states, best to avoid computers in favor of trusted people, paper, and memory. ;) However, many methods provide a meaningful increase of security or just recoverability. Worth remembering.

This particular product: too much risk in it for me to say if it does. People are probably safer with OpenBSD or hardened Linux/BSD on high-end embedded board or old workstation.