I was about to comment the same thing. Managers might interpret this in the totally wrong way and will probably end up using this against employees, like "you're not coding enough" and dump more work on you. Knowledge work, especially software engineering is way more than just time spent coding.

I as a programmer, however, might find this insightful, but then again be too hard on myself and wonder if I am not working hard enough. There's a lot to say about a tool like this, though. Interesting work. I'm too scared to try this out lol.

No, but who is the one interested in your improving? :-)