They actually address this: > Even with a memory safe language, memory management is not entirely memory safe. [...] Memory safe languages can also use librari

They actually address this: > Even with a memory safe language, memory management is not entirely memory safe. [...] Memory safe languages can also use libraries written in non-memory safe languages and thus can contain unsafe memory functionality. Although these ways of including memory unsafe mechanisms subvert the inherent memory safety, they help to localize where memory problems could exist, allowing for extra scrutiny on those sections of code. Which I suppose is a reasonable way to put it. It's been said elsewhere, but my read of this document is that this is not a _definitive_ list of languages you should use, but rather a list of languages that make it much more difficult for programmers to introduce memory-safety bugs.