I am not convinced of the validity of the methodology so have some difficulty with the conclusions drawn from the test.
That being said, I also have difficulty with the assumption that all Stradivarius instruments are superb and therefore worth vast fortunes. The man had to have some duds, he couldn't have done his best work all the time and right out of the starting blocks.
Another assumption that bothers me is that all modern instruments are inferior in some way.
Plus one or two minutes on an instrument even if the test was valid would only give results for first impressions. Could those opinions change if an artist played each instrument for say a month or in a concert hall?
For me "The Battle of the Fiddles" leaves more questions than answers.