In the folder are ai_hints as well, you don't have to use them, they just let the ai drive a bit smoother thru the chicane.
BMW Z4 GT3 before: 1:42:743
With new ai-line: 1:39:986
With hints: 1:39:980
BMW Z4 GT3 before: 1:42:743
With new ai-line: 1:39:986
With hints: 1:39:980