alt Hacker NewsEh, the only way to secure your Rust programs it the technique not described in the article.
Vendor your dependencies. Download the source and serve it via your own repository (ex. [1]). For dependencies that you feel should be part of the "Standard Library" (i.e. crates developed by the Rust team but not included into std) don't bother to audit them. For the other sources, read the code and decide if it's safe.
I'm honestly starting to regret not starting a company like 7 years ago where all I do is read OSS code and host libraries I've audited (for a fee to the end-user of course). This was more relevant for USG type work where using code sourced from an American is materially different than code sourced from non-American.
The only thing this leads to is that you'll have hundreds of vendored dependencies, with a combined size impossible to audit yourself.
But if you somehow do manage that, then you'll soon have hundreds of outdated vendored dependencies, full of unpatched security issues.