I don't find that sentence confusing, but I definitely found the article poorly written. Here's the sixth nearly identical map and now let's repeat the exact same thing already stated five times or more while including one new sentence of detail. The density of actual information in the writing is so low that it's hard to follow.

The article is so repetitive and padded out with empty prose that I found myself ignoring whole paragraphs. It's like the author decided to describe what an el niño is, then describe what an el niño is, then describe a super el niño, then describe what an el niño is, then describe what an el niño is, then describe what an el niño is, then describe the possible consequences of a super el niño, then describe what an el niño is, then describe what an el niño is, and finally describe what an el niño is.