This doesn’t read as all or nothing to me. If you’re communicating with somebody who doesn’t understand the acronyms (or even someone who might not understand the acronyms), and you still do it, then yeah, it’s a signal that there may be something underneath the surface there.

Obviously if we’re all familiar then go right ahead and save us all some time, but it’s worth considering how something as benign as using acronyms might subtly exclude people from the conversation for no good reason. The value of the article is in recognising this.