There is no room for a mistake or massaging data here. The authors have photos and video of magnetic levitation. It is either outright fraud, or true. You are claiming without evidence that these people intentionally faked the paper and it is entirely made up (which could well be true, but is a much stronger claim than shoddy statistical analysis, and much easier to prove).

As to prior work. All three authors have previous publications on perovskites. If the trick for room temperature superconductivity turns out to be putting a low temperature superconducting material in a crystal lattice where it doesn’t have enough room (which is a concept consistent with existing literature), then it seems reasonable that a perovskite researcher would discover it first as there is not really any special knowledge of superconductivity beyond the basics required (ie. The what is exceedingly simple if it turns out it works, the how is hard and is not the domain of a superconductivity expert).

Extraordinary claims and all that, but none of your criticisms are valid.