They're certainly easily disputed. Only 2 non local races trialled at each location. Why not all 11 in the study?
All it tells us is that the two races ( selected to fail?) did not cope as well with varroa and associated local viruses. It tells us nothing about how the vast majority of non locals would have fared . It also deals only with survival duration of untreated colonies in their first generation and nothing of comparative performance of treated colonies, which would surely be more relevant.
The study does little more than indicate the possibility of a local advantage and only in regards to duration of survival untreated.
Certainly not the basis for an import ban or a declaration in favour of local only bees as they are somehow superior.
The absence of a hybrid candidate is rather an oversight also.