I think the important part from the article that establishes the difference is this:
> As I mentioned, in command-based interactions, the user issues commands to the computer one at a time, gradually producing the desired result (if the design has sufficient usability to allow people to understand what commands to issue at each step). The computer is fully obedient and does exactly what it’s told. The downside is that low usability often causes users to issue commands that do something different than what the users really want.
Let's say you're creating a new picture from nothing in Photoshop. You will have to build up your image layer by layer, piece by piece, command by command. Generative AI does the same in one stroke.
Something similar holds for your comment: you had to navigate your browser (or app) to the comment section of this article, enter your comment, and click "add comment". With an AI system with good usability you could presumably enter "write the following comment under this article on HN: ...", and have your comment be posted.
The difference lies on the axis of "power of individual commands".