Your ability to strongly contract your pelvic floor is as important as your ability to relax your pelvic floor. This is why every training program has as many squeezing exercises as relaxing exercises. Thus, training with Perifit will help you better control your pelvic floor and make it easier to relax.
So yes, Perifit helps relax your pelvic floor muscles.
Moreover, the Perifit app features a statistic called "Relax" which assesses your ability to relax your pelvic floor. You will be able to see your relaxation score, your progression on that score and even tips on how to focus your training on this statistic.