The concept of randomness is a very confusing one. That is because we use it differently in everyday life than it exists on roulette.
In everyday life when we talk about a random event we mean an unpredicted, unexpected, unusual event. For example: meeting someone unexpectedly or winning the lottery or a flat tire or a lucky shot.
By this definition roulette is not a random game. Because in roulette we have very specific expectations. Every single number has exactly the same chance. And in the long run the results will conform to these expectations. You can’t call this “random”. At least not in the way we usually use the word.