I have to raise a little red flag on the above quote least other are led astray with a false sense of security.
When one says software is "vulnerable" that is usually in the context of security. Basically trying to stop bad actors from using systems in bad ways.
Whilst Rust certainly enforces lots of rules to help reduce silly coding errors that introduce memory use and other silly mistakes and whilst that prevents a lot of bugs that could cause security issues it does not ensure ones code does not have security vulnerabilities.
If Rust code contains security vulnerabilities, for example an incorrectly implemented encryption system, the programmar cannot blame the language or compiler for it.