Yes, it's a matter of expertise. The dean of a prestigious law school's opinion carries more weight than an adjuct professor. A Supreme Court Justice's opinion carries more weight than a federal judge at the trial level. The same in medicine and any other academic profession. I don't know why that's surprising.
And you never answered my question about in which journal the article appeared. Some law reviews only accept articles from very distinguished legal scholars. Anyone licensed can get a bar journal article published. Many publications are no more than propaganda for a particular political agenda. I suspect that this particular publication is the former.