TPM 2.0 first appeared on the market in 2014. Rust first appeared in 2015. And Rust took a while to become a mature system. TPM 2.0 was also an improved version of TPM 1.2, which came out in 2009.

So... maybe if Rust was a decade earlier.

Announced then, sure, that's a fine cutoff date. It did show clear promise before then in servo.

Rust can still be a standard going forward.

Better tools, better programs, Rust lang.

For something like TPM, IMO, using a memory safe architecture should be table stakes nowadays. I would go further: the design should be as simple as possible to achieve its requirements, and the implementation should be formally verified.