If a worst case to simulate on a classical computer is 2.5 days (per IBM's blog) then they should either:

1. Actually preform the experiment per their approach, compare the results, and provide tangible proof in the coming days.

or

2. Retract their claims.

In either case, exciting times ahead.

[Edit: Yes, I read their published paper[1] which only claims it is possible to achieve and does not perform the same experiment.

1. https://arxiv.org/pdf/1910.09534.pdf]