Ah, I see. So in this they’re using the word “Factory” to mean a function that crafts old-school style prototype objects. In the new ES6 style classes you don’t need those, and in the articles you reference he talks about why they’re better. I’d say the one thing he doesn’t get into is that the new ES6 classes are consistent. In the old style people did all kinds of crazy hacks and workarounds that made a lot of their code incompatible with other people’s code. It’d work for just using it, but if you tried to extend it you’d run into some weirdo hack they did to make some obscure OOP thing work.
The new ES6 classes are consistent, and that means everyone can use them to extend what you’ve implemented. That’s kind of the whole point of OOP in the first place. There’s no benefit to just wrapping functions and data up into some randomly designed prototype if nobody can then extend your design for their own code. The new ES6 classes make that much easier.