The article seems to detail exactly what the headline says. ¯\_(ツ)_/¯

We already experience 4D; our fourth dimension is time.

Correct.

In this economy?

Alternatively, the statement can be made in either of two additional contexts:

1. I didn’t bother to compare these because of their glaring dissimilarities/ my own laziness.
2. It is obvious to the casual observer that a comparison between these things would not produce a meaningful result, and therefore I’m pointing out that comparisons would be moot.