Yes, it's really false. They weren't saying that maintainers couldn't change the API nor that the maintainers who changed the API had to update the Rust part, just that they needed to tell the Rust maintainers what they did and what they intended so that they could correctly encode their underlying assumptions in code.

In other words, they simply requested adequate documentation and the response was "I'M NOT LEARNING RUST AND YOU CAN'T MAKE ME", effectively. That is nontechnical nonsense