What was claimed is that you can't get a Rust job which implies there are no Rust jobs, so it's important to call out the distinction. This was further implied by the tone of the article title which implied that the author was leaving Rust for good. While the contents of the article was more nuanced the title counts for a lot and has to be taken into consideration.

On the whole cryptocurrencies/blockchain jobs thing I'm not even sure I'd consider those real jobs. The overwhelming majority of those are startups that pay in equity and I expect nearly 100% of them to fail making that "equity" utterly worthless. I'd only consider positions in established companies paying actual salaries as real jobs.