At the time this article was written, you would probably be correct. But for about the past 5 or so years, there's been quite a few people in this space who have entertained the use of Rust instead. This includes people who write firmware, people who write drivers, even some of the people who work on the large operating system kernels themselves--you'll find examples of people who have indicated a desire to at least explore using Rust instead of C. And there's more languages in this space that have come out after Rust (Zig perhaps the most notable of those). While this view is far from universal, it's definitely the case that there's a large number of systems programmers who are interested in no longer writing in C.
> C is on paper not a safe language, but almost all of the most trusted safety critical software is written in it, so from a Darwinistic point of view it has produced more trusted software.
My understanding of things like MISRA C is that it's almost a completely different language--to turn C into something you can use for safety-critical stuff, you need to start ripping out or at least heavily curtail basically all of C's differentiating features.