Coming up with a new layout is HARD :D
The main constraints of a Corne-style keyboard is that there are much less keys available than what's necessary to write any latin-script language besides English.
One of the main design principles I had was to push all accented characters on an accent layer, breaking with Bépo where almost all of them are directly accessible (but need a full-size keyboard to work), despite some characters like é or à being much more common than Z or K for example.
My main goal was to optimize for French first, English second. Home row is pretty good for both and based on the Bépo layout, except U which seems pretty useless in English. Top row is OK I guess. More skewed towards French, but still rather optimized for both. Bottom row is good for French despite keeping the ZXCV cluster, the right part is not great for English. W and K are pushed to slightly less accessible positions because they are basically never used in French. But they are relatively common in English. So IDK.
That image is pretty cool. Looks like a heat map for most commonly used keys?
If so, please let me know what the name of the software is!
LibreOffice Calc and a lot of free time 😅