While I agree — my first exposure to PostScript as a programming language was playing around with examples from the Adobe "blue book"[1] over a bidirectional serial connection to a LaserWriter sometime in the '80s — nothing in this document requires PostScript.
The embedded images are in PICT format, and TrueType versions of the three fonts used (Courier, Helvetica, and Palatino) have shipped with all versions of the Mac OS since System 7 in 1991.
And while Word 4.0 shipped in 1989, so did Adobe Type Manager[2], which supported Type 1 fonts onscreen and on non-PostScript printers, though to get a Type 1 version of Palatino for ATM at that time you'd have also needed the Adobe Plus Pack[3] (or possibly acquiring Palatino by other means; I don't recall when Adobe started selling individual fonts and the Font Folio).
[1] https://archive.org/details/postscriptlangua00adobrich
[2] https://www.nytimes.com/1989/12/19/science/personal-computer...