I think you're reading into the comment too much. Rust by definition, will create a safer variant of whatever similar code you write in C or C++. This isn't really debatable, things like bounds checking on arrays, strongly typed error results, thread safe memory sharing semantics. These will absolutely guarantee that in general you will have safer code in Rust.
What I said is that it might take you longer to write it in Rust, than something similar in C/C++, but you won't have some of the guarantees you get from the Rust semantics. So the tradeoff is up to you; write code faster, or write code safer.
I'm always fascinated when people decide to have an opinion on facts. That little spark gets fanned into the flames of religion so easily, and it's no exaggeration to say it is a primary driver in the shape of our civilization.
I'm almost never fascinated when folks mistake opinion for fact. It's the primary driver in many language wars, as I see it. Some come to recognize that no language is perfect, especially their favored one. Others don't.