Here's my take: The author was born in the 90s, and was in elementary and middle school in the 2000s, when keyboarding was already seen as a primary skill. His take that "nobody writes cursive anymore" is true, given that for him, "everyone" is under the age of 30. Those of us who grew up prior to personal computers and phone touchscreens being ubiquitous can scream all we want "I learned cursive and I still write it…
There were no typewriters or computers through almost all of human history. Writing was it. This skill had, and to a large degree even today still has, enormous practical and economic value.
The utility of this ability to efficiently produce text artifacts is vastly higher when one can do so in a manner that is readily legible to others, which requires that one use an approximation of standardized, well-known glyphs. The closer you can produce them, the more differentially legible your written output is to others. It's not merely a coded signal for your elite status.
Even today when many can take notes on a keyboard, writing notes by hand has a well studied secondary practical effect of improving retention and comprehension, as well as being available any time a pencil and paper are at hand. These still work when dropped, when they get wet, when the power is out, or when you forgot to charge them.