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!", but it doesn't change all that much. Some of us learned and it and can't do it any longer. Some of learned it and still do it, for whatever personal or professional reason.
Here's the hotter take:
Skills like handwriting are (hold on to your hankerchiefs graphologists!) pseudo-sciences. They are vestiges of elitist education systems, whereby a bunch of rich, but likely average-intelligence, students who paid for elite education, hired private instructors to help them become members of the "learned class". It doesn't take any special intelligence to teach or to learn, and can be used as a signal to others that you "belong" to the upper class.
Fast forward to the 90s, in rural North Carolina, to a grossly underfunded school system that can't afford specialized training for teachers or students. What do we get? Over insistence on out-dated markers of education: cursive, Cotillion, woodshop for boys and home ec for girls. What don't we get? Computer science, math beyond algebra and geometry, science beyond basic earth science, and US history that stops at WWII! 1600 students with excellent penmanship, who know how to waltz, but none of us is even aware that computers can be programmed or that people get paid money to do it.
And to the commenters claiming graphology is a thing or that it is in any way useful in sorting candidates for job opportunities (I'm looking at you France), you are just as wrong as the author who claims "I don't use cursive, so nobody uses it either".
NB: This is not an attack on the hobbyists, or on the aesthetics of cursive in general. Well-written cursive is marvelous. I just think we had too much emphasis on it it school, and likely it was due to our schools not having the wherewithall to teach us anything else of value.