This is a pre-release not a final one. But running npm update -g seems to install the 5.7.0 pre-release, due to a second bug, so some people will still hit the filesystem permissions bug in practice, even if they don't try to explicitly install this specific release.
>This is a pre-release not a final one.
Which is not mentioned anywhere in the linked blog post.
Which is why I explicitly mentioned that, as the blog post is likely to confuse people in this regard.