What this paper in Nature proves is that a noisy yet powerful quantum system was able to solve a complex problem that a supercomputer could not.
Ok, back to the problems at hand. IBM addressed the noise issue by applying the error mitigation techniques we explored earlier this year
Instead of error correction, IBM used Zero Noise Extrapolation to reduce bias by increasing the noise by 20 and 60%, and then extrapolating back to the expected value at zero noise.... [+]IBM
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