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Exceprts from the article in LiveScience The skull in question, KNM-ER 1470, is arguably the most controversial fossil in the history of anthropology. When it was first discovered in northern Kenya in 1972, it was initially dated to nearly 3 million years old. Yet the skull—which scientists painstakingly pieced together from hundreds of bone fragments—had a large brain and a flat face, features reminiscent of modern humans but completely unlike any hominid known to exist at the time.

So troublesome was the skull that famed paleo-anthropologist Richard Leakey, the leader of the team that discovered it, once told reporters: “Either we toss out this skull or we toss out our theories of early man. It simply fits no models of human beginnings.”

Impossible face
Bromage said the original reconstruction relied on preconceptions about how early humans looked that are now known to be incorrect. The result, he said, was a skull that shared several features in common with modern humans, including a relatively flat face and a large brain case.

In the original KNM-ER 1470 reconstruction, this angle was between 60 and 75 degrees, Bromage said. “It was absolutely incompatible with life,” he said. “The jaw would have been positioned so far back in the skull that there would have been no room for an airway or esophagus. It couldn’t breathe or eat.”

From your link:

Martin also disputes the claim that H. rudolfensis’ large cranial capacity made it stand out among ancient hominids. Martin points out that a 1.6 million-year-old Homo erectus skeleton known as “Turkana Boy” had a cranial capacity of about 900 cc.
“At 1.9, you’ve got [H. rudolfensis] with [a cranial capacity] of 750 cc, and at 1.6 you’ve got 900 cc. I don’t have a problem with that,” Martin said.
If confirmed, KNM-ER1470’s new cranial capacity would be comparable to that of H. habilis. “Now it’s no longer an outlier,” Bromage said. “It’s just part of the gang.”