The Sentai Helmet up until now was only available to players during the official Ubisoft E3 2019 Twitch streams. Since then, players have been asking Ubisoft to do these streams more often so that they have a chance of actually getting it. Instead, Ubisoft went one step further and now the Sentai Helmet is available to anyone who owns the game for only 30 Ubisoft Club points!
For more info, visit the official Ubisoft post here.