Can you please provide a link for this claim cause I haven't seen it anywhere else. This timeline of Trump and Epstein's relationship makes no mention of your claim:
https://www.nytimes.com/2025/07/17/us/politics/timeline-trump-epstein.html
With that said, cooperating with an investigation doesn't necessarily enhance a claim of innocence. The government can usually compel you to comply through court order if you don't do so willingly. So it's possible Trump cooperated cause he would have been compelled to cooperate otherwise.
If Trump had turned in Epstein that would be another story. Providing evidence that gets someone arrested is a strong sign of innocence. However, simply cooperating with an investigation doesn't provide a strong suggestion of innocence.