I think context and audience matter a lot. The post seems to mostly be talking about acronyms in the context of writing that's aimed at a public audience, but a lot of acronym use is aimed at a much more targeted audience.

For example, I work on a product that pulls data about plant species from various data sources. I'm not about to type "Global Registry of Introduced and Invasive Species" or "Global Biodiversity Information Facility" everywhere; everyone on my team, and pretty much anyone working in this problem space, knows them as "GRIIS" and "GBIF." If I wrote the names out every time, it'd probably be less clear to my audience: they'd most likely have to reconstruct the familiar acronyms in their heads to follow what I was talking about.