Beerus has at least a few dozen million years of an experience advantage, a vast arsenal of different techniques, and is portrayed as still being vastly more skilled than Goku and Vegeta currently, with DBS Goku having better skill feats than GT Goku if I remember correctly.
He isn't because he's going to dodge Nova's visible attacks moving at a speed he is capable of avoiding that he would know to avoid at all costs. Nova doesn't know the strength of his attacks, and Beerus' Hakai isn't a projectile, he just points and erases. Nova isn't going to "dodge" that. Even if he could dodge it, he wouldn't know what it does, and doesn't know if he's stronger than Beerus or not.