The StereoPi v2 is the follow-up to the 2019 first-generation model, which brought stereoscopic photography to the Raspberry Pi Compute Module 3. Similarly, the StereoPi v2 enables the functionality of the Compute Module 4. The StereoPi v2 also supports the CM4 Lite.
https://www.notebookcheck.net/StereoPi-v2-The-stereoscopic-camera-module-for-the-Raspberry-Pi-Compute-Module-4-is-now-available-to-order.526415.0.html
So.. it's a raspberry pi compute module with two camera modules?