Let's grasp the difference of ReDriver and Retimer

- ReDriver / Repeater IC / Signal Conditioners
Redriver, also known as repeater IC, regenerates signals to boost the signal quality of high-speed interfaces. Faster signal frequencies leave designers with less signal margin in which to design reliable, high-performance systems. Using equalization, pre-emphasis, and other technologies, a single redriver can adjust and correct for known channel losses at the transmitter and restore signal integrity at the receiver. This results in an eye pattern at the receiver with the margins required to deliver reliable communications with low bit error rates.

- Retimer
A Retimer offers many advantages over a typical re-driver. For improving signal integrity a re-driver can only reduce Deterministic Jitter (Dj), but actually adds to the Random Jitter (Rj) it receives. A Retimer will eliminate Dj, and completely reset Rj (to a low value), so the transmitter signal is much cleaner giving better margins or enabling longer trace/cable.

reference:
https://www.pericom.com/products/redriver-repeater-ic-signal-conditioners/
https://www.idt.com/document/msc/pcie-gen3-retimer-frequently-asked-questions
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