Relevant: https://www.lesswrong.com/posts/Kbm6QnJv9dgWsPHQP/schelling-...
can someone be a considered authority without being an expert.
edit:
I am using authority from the example in wikipedia
"One example of the use of the appeal to authority in science dates to 1923,[20] when leading American zoologist Theophilus Painter declared, based on poor data and conflicting observations he had made,[21][22] that humans had 24 pairs of chromosomes. From the 1920s until 1956,[23] scientists propagated this "fact" based on Painter's authority"
Painter presumably was an expert. So not sure why you are saying why its ok if the person is an expert.