I would hardly characterize this as a breakthrough: https://openreview.net/forum?id=r1RQdCg0W
If the title does nothing to describe the actual discovery made and solely consist of "Breakthrough in [Field]" then it's definitely not a breakthrough.
edit: who else? https://www.johndcook.com/blog/2013/03/18/was-betteridge-rig...
Which matches the abstract. If this has general applications it's a pretty big leap to shrink model sizes and speed up training by orders of magnitude, especially at a time when many SOTA models are only feasible for well funded groups because of their size.