"It makes the whole world afraid of what is in fact just matrix multiplications" is such a reductionist view that doesn't really capture the reality of AI taking people's jobs and reshaping the economy. That's like saying electricity is just "electrons moving through a wire"
You and the comment you're referring to are both making good comments, but may not be talking apples to apples.
I believe the post you're replying to is just saying that matrix multiplications (as useful as they are), aren't going to become Skynet.
Your post is pointing out that various AI techniques are replacing loads of jobs for folks that still need to make ends meet, but likely don't have the skill sets to magically become a web developer overnight. As a result, AI is pretty dangerous like many disruptions throughout history. Only in the past, there was usually still plenty of need for labor.
These matrix multiplications won't become Skynet, but that has nothing to do with the fact that they are matrix multiplications.
The better we get at understanding how various cognitive functions that once seemed mysterious can be accomplished by matrix multiplications, the easier it becomes to eventually create Skynet.
“Just a bunch of matrix multiplications” is also a bit odd because lots of jobs have been automated out of existence by tools way less complicated than matrix multiplications.
The weird thing, I think, about these matrix multiplications, seems to be that they might be coming for the jobs of people who are generally in the same field that invented them (programmers) and also they might be coming for the jobs of reporters, creatives, and hot-take authors. People with bigger platforms than factory workers.
