I agree to an extent. I also have ADHD and find these things useful, but the tradeoff is that to be effective they always have to be important in a way a cell phone or smart watch is very bad at guaranteeing since their main customer isn't the consumer but the advertising firm. I wish bespoke PDAs were still a thing (or at least, an easily accessible thing)

The larger point of the article is that these new devices are dependent on your continued labor to keep them running usefully. Moreover, this is a choice in how they're designed.

The article isn't saying they don't do other things, it's just not relevant.

For the record, I also have ADHD and I find the opposite impact on my psyche.