No but Yes...
The TrainAsONE system has no direct knowledge of the 'human' coaching concept of taper and so does not explicitly plan one. However, as part of it's own artificial intelligence (AI) / machine learning (ML) knowledge it does most commonly introduce a drop in training volume in the lead up to a race.
Furthermore, due to user feedback, workouts that are believed to form part of a taper are tagged as such for display purposes in the user interface, for example in the Calendar.