When your estimated max has been flat for a few sessions, Rhythm suggests a short deload or a variation of the lift, a common next step and not a promise.
Flat has a definition in the app. Rhythm tracks an estimated one-rep max for each lift from the weight and reps you log, and when three sessions in a row land inside the same narrow band, it flags that lift. It stays quiet until you have around twelve sessions of history, so a slow start is never mistaken for a wall.
A short lighter week, or a variation of the same movement. A different rep range. A pause at the bottom of each rep. These are the things lifters and coaches usually try next when a lift stops moving — that is the whole claim, and it is not a promise. Whether any of them restarts your progress depends on you, and we cannot know that in advance.
It will not add weight to break a stall. Telling you to push harder on a number nobody worked out is how a training app gets someone hurt, so when a lift is flat, the suggestions move down or sideways, never up. Weight goes up when your logged sets say it can, and that happens on its own once the reps come back.
A lighter week is not a week off. Keep showing up, keep the movement in, and let the numbers come back to you.