It's really not a completely fair comparison when some of the instruments are hundreds of years old. Wood continually changes (on a molecular level) as it ages, even after it's been made into a musical instrument and it's been dry for years. In the acoustic guitar world, if the guitar is built with solid tonewoods, it will continually sound better as it gets older. That's well known and anyone who has had a great guitar for more than a few years knows this from firsthand experience.
The results that Solar Bell got in his (just as scientific) study .... are more of what you'd expect. Those strads are not legendary for nothing. Plus, they have a few hundred years head start in sounding better than the ones recently constructed. I like his study better.