I think it is difficult to say yes or no without knowing you personally. Some things to think about:
If you are not aware of the good movements and coordination to press, you might strengthen the wrong way and it will be bad to your technique. You might strengthen the problem. So I think that if you are a beginner, this sort of exercise is even worse. It is better to do perception exercises, to improve coordination, rather than brute force.
Muscle fibers for strenght also compete with those for speed. If you strengthen too much, you loose speed. I personally think guitar is more about coordination and speed than strength.
In my experience, and with other teachers I know, there is a strong tendency to tense the wrist while pressing too hard, which is terribly bad to technique, so be sure you learn to tense only fingers.
With that said, I use, sometimes, a Dynaflex Gyro. With the Dynaflex I learn to shake it with arm and hold it with the fingers with a loose wrist as well as loose shoulder and neck. I felt it helped me to learn coordination loosing myself while keeping a good grip. But I do it eventually, I avoid building up strong muscles, since for the reason I pointed before, I think it hinders speed.
It seems, to me, that because the Gyro requires constant circular motion, there is less tendency to tense everything and get hard, you must do it with a loose attitude to keep it moving. So it seems less likely to develop too much wrong tension. But I am not a specialist, it is just my impression.