It's in the main project repo, since ecode it's part of a much bigger project: https://github.com/SpartanJ/eepp/

Here's the explanation: https://github.com/SpartanJ/ecode/?tab=readme-ov-file#source...

it is or at least, the source is present check the readme, he has the source in the GUI repo

It is, the link is in the readme.