This is quite a nice project, but is not an off the shelf solution. Most folks may get by quite well with the 4 or so fans that a PC can already control, but if you need this level of granular control for up to 10 fans, this project may be for you.
It is also open-source hardware, and a lot of thought went into how it can easily connect inside the case. The video he published does explain it very well.
I see the board has place for external temperature sensors to be added, which he does not seem to be using yet, and of course, the other big thing is the automation by 3rd party software to manage it.
That all said, the project appears to have been published only about 4 days back, so there may be a lot more contributions that will still be made to this project.