They are not saying every language will have same level of improvement as Rust, they are saying you can most of the improvements is available in most languages.
perhaps you get 1300MB to 20 MB with C# or Java or go, and 13MB with rust . Rust’s design is not the reason for bulk of the reduction is the point
Sure, but until people actually have real data that’s just supposition. If a Java rewrite went from 1300MB to, say, 500MB they’d have a valid point and optimizing for RAM consumption is severely contrary to mainstream Java culture.
perhaps you get 1300MB to 20 MB with C# or Java or go, and 13MB with rust . Rust’s design is not the reason for bulk of the reduction is the point