The precompiled implementation is the only supported way to use the macros that are published in serde_derive

That statement is straight up gaslighting.

The precompiled binary is only provided for one platform, Linux. Windows does not use a precompiled binary but compiles its own from the source. How can he claim it's the "only supported way", when for most platforms he is doing it another way? Also, the crate, throughout most of its life, has been doing it another way.