Earlier quoted context omitted.
it's rare for "layman" to find true errors in papers, and you weren't a layman when you did your investigation, as you say in the article. That said, 90% of all papers contain at least one important error that brings the conclusions into question. Note that even great papers that established long-accepted truths contain important errors, see both https://en.wikipedia.org/wiki/Oil_drop_experiment#Controvers... and htt…
Although it's true I wasn't a layman, it turned out my own expertise in bot fighting had no utility to reviewing the paper. The review was done as a "layman", because the sociological subfield of twitter bot research has nothing to do with bots :( Anyone could have written that and actually most of the paper takedowns in that subfield are done by a team of a CS prof (with no specialism in bots) and a data journalist.
(put another way: many papers that contributed what appears to be new, true knowledge contain factual errors, some of them invalidating, yet the paper turned out to be correct, in terms of its conclusions, in the long run)