The algorithm is plain faster on the most advanced hardware. For such an already heavily optimized area, that is very impressive.

>Leveraging this diversity, we adapted AlphaTensor to specifically find algorithms that are fast on a given hardware, such as Nvidia V100 GPU, and Google TPU v2. These algorithms multiply large matrices 10-20% faster than the commonly used algorithms on the same hardware, which showcases AlphaTensor’s flexibility in optimising arbitrary objectives.

https://www.deepmind.com/blog/discovering-novel-algorithms-with-alphatensor