It's not “memory safe in practice”. It's “we provide tools to make our memory unsafe language with as little memory issue as possible”. Is it better than what C or C++ offer out of the box: yes. It's totally reasonable to think that it may be as good as C or C++ with state of the art tooling that most programmers aren't using today because they don't want to invest the effort, so this is a big progress over C.
But this shouldn't be called “memory safety”.