http://tierra.rediris.es/megacryometeors/megacryometeors.pdf
Like most popular news articles on scientific topics, the journalist has sensationalized and distorted the actual issues.
That aside, I don't know why Martinez-Frias calls them 'megacryometeors' since he is theorizing that they are hailstones, not meteors.
One of my favorite stories of 'scientific ignorance' involves meteorites. Aristotle reported stones (and frogs) falling from the sky and had his own theories. By the Enlightenment, Aristotle had been discarded and scientists assumed that falling rocks and frogs were ancient myths. When occasional reports would come in about falling rocks they would be discounted as tales from ignorant farmers.
In the late 18th Century there was a meetings of scientists in a French provincial city which coincided with a meteorite shower. The scientists finally believed that stones could fall from the sky when they saw it themselves. They literally had to be hit over the head with the evidence.
(Frogs and fish really do fall from the sky too.)
...and COWS too. Really!
Hank