Since I had several people contact me about this:

The league stats tool is currently not working properly. It seems that some change Christer had to make for the 2020 update broke it.

Currently I have no time to fix it, as all my coding time goes into the client update.

So for all of you who were wondering about it: It is somewhere on my list but it will take some time :-)

And thanks to everyone reporting it, I am very happy this is useful to you people.