I would agree with you if this paper was citing... more papers. Since there are so few and one of the citations is a concurrence with the paper with actual data work, then it harms this paper.
Either the author didn't do a literature review before publishing, isn't well versed in the field, or chose not to cite works which may not agree with their results. Neither of which reflects well on the author.
Either the author didn't do a literature review before publishing, isn't well versed in the field, or chose not to cite works which may not agree with their results. Neither of which reflects well on the author.