I assume that Amazon getting too much control is a real problem. But also suspect that deep down the true concern Klabnik has is that Steve Klabnik thinks Rust is about him, or at least he is the one that is supposed to write articles about what Rust is about. Not someone from Amazon or anywhere else.
I do not think Rust is about me. Note that I specifically say that Rust should not be about any individual, let alone a company. I’ve made my case against BDFLs for years.
He's pointing out big changes coming to control of the Rust foundation and positing that Rust foundation being controlled by one large single corporate entity probably is not a good thing. Nothing in there seemed to me like he wanted to be the one in control.