Personally getting diagnosed with dyslexia was a huge help to me. Like the article mentions it allows a mindset change when you can put a name to why you can't do something despite a tremendous amount of effort that other people can seemingly do easily. It also becomes a valuable tool to help protect yourself when needed. There were multiple times in my elementary and middle school years in which the ADA needed to be evocated on my behalf in defense against two specific bad teachers I had over those years. I wouldn't have gotten the accommodations and help I needed if the initial diagnose was just "slow to learn to read".

Side note, this was only possible because my parents knew the system, my mom was a teacher, and they had the resources and wherewithal to fight on my behalf. I can certainly see how not having that helps contribute to the inequality talked about in the article. I can also see how parents looking for any advantage for their child might abuse that system. However I don't think the potential for abuse warrants throwing the baby out with the bath water.