That cannot possibly work. Color isn't anywhere close to a reliable predictor of ripeness. If it were people wouldn't have to squeeze-test them. Different sub-varieties have different skin colors. Two avocadoes with identical colors (even of the same variety) can have wildly different ripeness levels, and an individual avocado won't change color consistently as it ripens.

A bin has avocadoes from different farms, and therefore different sub-varieties. They'll all be Hass, but not clones of the same tree. So you can't even just program in that these avocadoes came from X location.

They claim to have success so perhaps they've got something else going on.