The article spends multiple paragraphs on exactly this. Did you read it in its entirety?

"This can be a difficult idea to swallow. Imagine you’re looking out at a countryside scene. You see rolling hills, the vibrant sunshine and a herd of cows. You hear the birds, smell the fresh cut grass and feel the wind on your skin. Surely you are conscious of this whole scene all at once. But we know that working memory has a capacity that is far too tiny to fit all of this information in at one time. If consciousness arises from working memory, then how can I be conscious of all this stuff at once?

Indeed, some philosophers and scientists have argued in just this way, saying that consciousness overflows the capacity of working memory. If this is true, it would be a problem for those who think that consciousness arises from working memory."