Yes and no - you can win on a large enough sample of hands consistently, but not every session let alone every hand. Poker is a highly volatile game. Upswings are followed by losing streaks, and you cannot change this aspect of the game no matter how hard you try. In poker, there will always be a factor of luck. But if you strive to make the best decisions, in the long run, you will be in the black.
The main thing is not to forget about bankroll management, and then no down streak can strike a critical blow. It’s a game of patience, logic, and mathematical decision-making. The consistent winners have mastered all of these areas on a high level.