I am curious because tle last dev activity was three years ago.

Yes, the project is still alive, but FreeRCT suffers from a chronic shortage of developers so it's going on veeery slowly, and with long gaps between contributions.

I split my time between contributing to several FOSS projects of which FreeRCT is one, and I'm actually working on some stuff (currently, related to the UIs for coaster and other ride selection, construction, and management), but don't expect the changes to become visible anytime soon ☹️