The author points to Microsoft as a typical example of corporate programming in the 1990s.
Yet Microsoft wasn't using a (pseudo)waterfall development model. Quoting Steve McConnell in "Rapid Development (1996) Page 271:
] In addition to providing explicit support for morale, Microsoft gladly trades other factors to keep morale high, sometimes trading theme in ways that would make other companies shudder (Zachary 1994). I've seen then trade methodological purity, programming discipline, control over the product specification, control over the schedule, management visibility -- almost anything to benefit morale.
As I've pointed out before, I've read about software development projects at Apple, Be, Commodore, Data General, id, Infocom, Microsoft, VisiCorp and others. None were using (pseudo)waterfall.
I therefore agree with bdefore that it seems to have been "far from ubiquitous and mostly limited to government or very large corporations", and that the era of waterfall was a mythical beast.