What's described in the article is indeed true, you can build stuff without syntax, you can extend it, etc.
But who is this for? I am not a fan of the "Let's teach everyone to code" rhetoric, because this is same as "let's teach everyone to play the piano", or "Let's teach everyone to be good at math!". People who will code will code even if you don't push them to. And most others, well they have other better things to do in their lives like making art, becoming a scientist, or becoming a doctor.
With this type of "programming", I think their trouble is they don't know who they're building this for. Here's what actually happens:
1. People who want to do serious programming will immediately find out how inefficient this method is compared to "writing syntax", and switch to real programming.
2. People who are hobbyists will find that it's not so hard to learn "real programming" once they get into programming.
3. People who want to learn to program to get a job, will of course learn real programming
4. People who want to build things but can't learn programming languages will maybe use this to write a prototype, but then immediately hire a "real programmer" once they see any sign of taking off.
5. The "education" purpose is also out of touch too. If I wanted to teach my kid how to program I would teach him python. It's not that hard.
6. Most other people won't and shouldn't care about coding. There are thousands of other interesting things to do in life.
I am all for making it easier to build things, and I appreciate that they built this so the world can experience what it feels like to try something like this, but I really can't see any possible use case for this.