The original study has 29 contributors
The lead author has also published in the Journal of Environmental Toxicology and Chemistry

The CV of the second author
James T. (Jim) Anderson, Ph.D. is the Davis-Michael Professor of Forestry and Natural Resources, a professor of wildlife ecology and management, and the director of the Environmental Research Center at West Virginia University (WVU). He earned a B.S. in wildlife from the University of Wisconsin-Stevens Point, an M.S. in range and wildlife management through the Caesar Kleberg Wildlife Research Institute at Texas A&M University-Kingsville, and a Ph.D. in wildlife science from Texas Tech University. He has been at WVU since 1999 and has been a Certified Wildlife Biologist since 2003.

In academics, anything published is immediately peer reviewed, and the peers establish their reputation by proving you are wrong.
Studies later shown to be in error, after additional work, can be forgiven.
Poor investigative techniques, or even worse, faking it, destroys the author's academic career.
The careers of 29 smart folks were on the line, and if someone was making stuff up, someone would have fessed up.

We may certainly, and should, evaluate the numbers derived from the investigation, knowing that the interpretation thereof is always influenced by preconceived opinions/agendas.
And we certainly need to express our opinions as to decisions made by regulatory bodies based on the numbers.
Number we don't like however aren't necessarily "junk science".