Half-Life Regression

Hi, did anyone have to deal with Half-Life Regression (https://github.com/duolingo/halflife-regression) ?

I would like to compare this model to alternatives and the paper only compared this to logistic regression. I find it strange since to me it’s a classification algorithm which seems to be deflected to work as a regression algorithm predicting recall probability between 0 and 1.

Would you give me any advice?