If you want an independent look at the specs, CNX Software and Hackster just wrote about the board here:
https://www.cnx-software.com/2025/12/26/cerelog-esp-eeg-a-lo...
And here
https://www.hackster.io/news/this-open-source-eeg-board-brin...
https://www.cnx-software.com/2025/12/26/cerelog-esp-eeg-a-lo...
And here
https://www.hackster.io/news/this-open-source-eeg-board-brin...
Welcome to HN! I hope your project gets some good discussion.