According to Osho, yes—repression is also karma. Karma means action, and repression is an inner act that leaves impressions, binding you to repetitive patterns and suffering. When you suppress, you create further karmic momentum; when you become aware and allow energy to move consciously, the chain weakens and dissolves, opening space for freedom and authentic response.
Pushing feelings down is still an action that sticks to you; noticing them and letting them pass sets you free.