I'm guessing they're conflating memory safety with not having memory leaks. Of course, Rust doesn't prevent memory leaks either, although they might be less likely? I'm not sure how often Node.js codebases keep around memory allocations that aren't actually needed any more.
I suspect the most common example (IME) of leak in garbage collected systems (putting more and more things in a collection that you never use again) isn't notably harder with explicit or Rust memory management.
