Yes just disabled, but in a way that is not possible to re-enable it. It has been that way for at least 9 months. See this post for more information
If it - or any other launcher app - were enabled in the build, then the user would be offered a choice at the end of first time processing (i.e. the first time the Home screen is displayed), between all the available launcher / home screen apps. I believe tat is why /e/ disabled Trebuchet: they want to promote their own Launcher rather than let users choose