It's obsolete. DEFLATE format is limited to 32KB LZ window with huffman coding.
Zstd can use a much larger window (8MB recommended) and a much better entropy coder: https://github.com/Cyan4973/FiniteStateEntropy
Zstd can use a much larger window (8MB recommended) and a much better entropy coder: https://github.com/Cyan4973/FiniteStateEntropy
Now you know why they are comparing 16KB payloads only.
We also have some half baked ideas to combine a fast SW match finder that only looks for matches >64KB away, and supplements the matches that QAT finds.