Ah, thanks for digging into the actual paper and providing that context.

This chart is just replication attempts. 

When people do attempt to replicate results in econ, they're more often able to do so than in other social sciences. That may actually be the reason there are fewer replication attempts: the juice isn't worth the squeeze.

Undisciplined

The tricky thing is what "same methodology, different data" means for economics.  Replication is genuinely hard because the data sources are varied, and minimum wage applied in various settings could indeed have different effects.  That wouldn't be a replication crisis, just an acknowledgment that effects are highly context dependent.