I think you missed the point of the post you are responding to. That person understands the value of the bug, and is just pointing out that Rust runs with unchecked math in production and would therefore be just as vulnerable in production. The benefit would come from it running with checked math in debug mode, but you, as the parent posted noted, would have to have a unit test or an integration test that realized this vulnerability to begin with and tried to exploit it.
The use of "unrealistic" was meant in the sense that you wouldn't think of it, not that you shouldn't guard against it once known.
The use of "unrealistic" was meant in the sense that you wouldn't think of it, not that you shouldn't guard against it once known.