It is open source, and as stated above the no tracking is more on the lines of it isn’t sending the data it collects to another instance.
But Discourse is collecting quite a lot of data. And there is at least no GUI option to turn off most of the data collection.
I guess because it is open source someone could build an option where this data collection isn’t build in or disabled.
But as far as I know nobody has done this yet.
We as Safing were playing around with the idea of creating such a fork, but it would be quite a hassle of maintaining it and we currently don’t have the resource to spare for such an endeavor. Maybe we will create something in the future.