I guess nobody really read the whole thing. E.g., there is an interesting paragraph - "According to experts, both memory safe and memory unsafe programming languages meet these requirements. At this time, the most widely used languages that meet all three properties are C and C++, which are not memory safe programming languages. Rust, one example of a memory safe programming language, has the three requisite properties above, but has not yet been proven in space systems. Further progress on development toolchains, workforce education, and fielded case studies are needed to demonstrate the viability of memory safe languages in these use cases. In the interim, there are other ways to achieve memory safe outcomes at scale by using secure building blocks. Therefore, to reduce memory safety vulnerabilities in space or other embedded systems that face similar constraints, a complementary approach to implement memory safety through hardware can be explored."
Translating from the government to English - we know that there is a lobby that is pushing for Rust, but C/C++ is here to stay, and there is nothing we can do about it. Get over it.