The text that follows does take on a new meaning though, for those that know linear algebra:

If the mere sight of the above is like a punch in the face for you, don't worry.

Almost makes me wonder if it was intentional.

Bears. Beets. Battlestar Galactica!

But what does that illustrate?

Like, what a matrix looks like? Seems fine.

But, as a few people have pointed out, that particular matrix product is undefined. It's broken. That's really not quite what a matrix-vector product looks like.

The author says he has PhD. That's fine. I suffer from the same condition. But it feels off to hear about expertise and see an invalid first example.