The Modern Forgery Hypothesis

[RobGea]

Any argument that roughly states  "poor/ inconsistent use of diacritics in PUG 555-568 texts in the Kircher correspondence means forgery"
would mean that consistent and correct use of diacritics was the norm for the period of time that letters in the Kircher(1601-1664) correspondence were written.
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>Height: 1500–1700
>Latin in school education, 1500–1700
>Orthography >Diacritics

TL;DR Latin from 1500-1700 was a language in flux, allusions, references, styles and pronunciation from regional and national vernaculars
found their way into texts of the time. Standards of Latin education across Europe were not even.