Perhaps scientists will create a checklist for performing experiments on potential superconductive materials with caveats and gotchas.
A team going down the checklist would either demonstrate one of
1. They performed the step in the checklist and provide the corresponding sufficient/exhaustive evidence of having done so.
2. An explanation as to why that step is not applicable allowing them to skip said step.
An afterthought:
3. The following will not always be possible for any given experiment. However, the LK-99 experiment used cheap materials and a relatively straightforward process to create the material (from my readings of what others have said), I think the scientists in question should have attempted to reproduce the results of their experiment and document the number of successful attempts versus total attempts.
This is basic software/systems validation that's required in many industries (my experience being in life sciences, but have also seen this in aerospace).
That's not trivial, because if it's known to be impure then you expect some resistance in your measurement, you already know it won't be 0R. And if you think it is pure and superconducting then how low does your test equipment go anyway?
I'm not an expert in the field at all, but aiui that's why they would have been looking at what seem like roundabout tests etc. that don't seem like they're actually addressing what's interesting.
Impurities shouldn't increase resistance unless you have no supercondting path between your probes. If you don't, other tests will be hardly conclusive either.
And yeah, you want the equipment sensitive enough to see that it is better than good metal like copper, which may be nontrivial in case your critical current is low.
A team going down the checklist would either demonstrate one of
1. They performed the step in the checklist and provide the corresponding sufficient/exhaustive evidence of having done so.
2. An explanation as to why that step is not applicable allowing them to skip said step.
An afterthought:
3. The following will not always be possible for any given experiment. However, the LK-99 experiment used cheap materials and a relatively straightforward process to create the material (from my readings of what others have said), I think the scientists in question should have attempted to reproduce the results of their experiment and document the number of successful attempts versus total attempts.