The real issue is whether publishers of scientific journals should retroactively apply contemporary standards regarding duplicate publication or self-plagiarism to historical papers. The journal publishing norms in the early 20th century were substantially different. The emphasis was on achieving the widest dissemination of knowledge across a fragmented scientific community separated by language and geographical distance, publishing in many different journals. As a result, the boundaries were heavily blurred between lectures, conference proceedings, booklets, collected essays, published journal articles and so forth.
The scientific enterprise has since evolved to the point where it is dominated by large commercial publishing groups that are much more sensitive to protecting copyrights and turning
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