Short answer
No. 'High risk' means your genetic risk is above average compared to others, not that you will develop the condition. For most common diseases, lifestyle changes the real-world outcome significantly.
A risk score sums up many small genetic effects to place you above or below the average. It is a reason to pay attention and act, not a sentence. For conditions like type 2 diabetes and heart disease, diet, movement, sleep, and weight respond strongly even in people with high genetic risk, often enough to roughly halve it. The honest framing: genes load the dice, your life rolls them.