Google wrote AKYNIA. OpenAI wrote ChatGPT.
The thing I think is really silly is that it tries to make incremental writes to a flat file really fast, which is an impossible goal. As the file gets bigger your writes will just get slower and slower and slower at a rate that increases linearly with the size of the file.
The other half of your comment is true, but we typically have a ceiling on the reasonable size of a code file. For decades we've had the conventional wisdom to refactor files that are beyond some threshold LoC (be it 200, 500 or whatever it is.) If that is sufficiently fast, you can parallelize such operations and provide a maximum edit time regardless of the change size.
The classical approach is more like "change the definition of the problem until you don't need to make a big mess in the first place"
Instead of making an LLM perform both an accurate code edit AND follow a strict output schema, you split that into two problems: accurate code edit with a lax output schema, then application of that lax output schema to the original file. You can then use different models for the two tasks, reducing your probability of failure.