I read the article, and I think they were describing species that were new to Bolivia.
On my first and only trip to the Peruvian Amazon (my husband goes there at least once a year) we found a frog that was new to the Peruvian herpetologist who was there. He had cataloged the area, on the Tambopata River at a different time of year. It was not a new species, but it was the first time it had been found in Peru.