It seems like legitimate questions from an outsider to me. As an outsider from both kernel and rust development myself, I also had the same questions going through my head. Specially given Linus' previous opinions in using other languages for kernel development. That, allied with how eagerly rust is hyped, does make one wonder how much is self-promotion and how much is actually the linux kernel community as a whole embracing the endevour (not just the subset of kernel developers who also happen to really like rust). I feel like they are honest questions. Someone more in touch with the kernel community should be able to answer them.