I used Sabayon for a bit too. It was basically “Gentoo made easy” with a simpler installer and as you said a binarypackage manager rather than compiling packages from source. It’s wasn’t 100% completely dead after dropping the Sabayon branding, it morphed into Mocaccino Linux, but when they did so they re-based it on Funtoo, which is also now dead.
IIRC both are made by the same dev.
I just clearly remember this making the rounds on Linux YouTube earlier this year with every one of them who looked at it telling people to not let it touch anything resembling your machine.