I don't think he's changing the narrative all that much...just expanding on it. I think the last paragraph in these excerpts from your article is the take-away we should all have.
From your article:
“The rate at which this virus is mutating or evolving is not unexpected; it’s exactly what we would expect for a virus like this,” says Nathan Grubaugh, a virologist at the Yale School of Public Health in New Haven, Connecticut. “All viruses continuously evolve and there shouldn’t be anything alarming about the process in general.”
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"Viruses do mutate at a particularly high rate, especially ones like SARS-CoV-2 that use RNA for their genetic material. Unlike organisms that use DNA, these viruses don’t have the ability to fix mistakes that happen when they copy their genetic code. This means that RNA viruses tend to evolve more quickly than other organisms, says Richard Kuhn, a virologist and director of the Purdue Institute of Inflammation, Immunology and Infectious Disease in West Lafayette, Indiana.
However, the bulk of the mutations that appear as a virus spreads are either harmful to the virus itself (meaning it is less likely to survive or replicate) or don’t change how it functions. Additionally, the two characteristics that are of most concern right now—how contagious the virus is and how harmful it is to its hosts—are controlled by multiple genes, Grubaugh says. Changing these characteristics is a complicated process, and not often the work of a single mutation. So the odds of the virus mutating in such a way that it actually becomes more lethal or contagious over the timescale of weeks, months, or even a couple years aren’t very high."
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"Coronaviruses can undergo major changes that make them more of a threat to people. After all, the ancestors of SARS-CoV-2 were only able to infect non-human animals. The virus did eventually mutate so it could transmit from animals to humans. But it probably didn’t gain this ability in one fell swoop. “These events happen over the course of many, many years,” Grubaugh says.
The new coronavirus has changed in subtle ways since the outbreak began in the city of Wuhan in China. On March 3, scientists in China reported that they’d identified two separate strains of SARS-CoV-2. However, these two versions of the virus are nearly identical overall, Grubaugh says. One does not seem more deadly than the other, and a vaccine for one would also protect against the other.