I wouldn't say it was a fluke. Far from it. It was a well crafted, great drive and a deserved win.
What I will say however is that a defeated Hamilton is a dangerous Hamilton. He tends to want to bounce back hard from a defeat.
Merc has the best car on the grid and he (Hamilton) will want to make hay while the sun shines.
If Bottas does win again, its going to be an interesting season.