It's a little disingenuous to say it's not deadly at all when up to half a million have died from it (depending which numbers you count) with no end in sight.
And, putting quotes around 'expert' doesn't make them any less of an expert. This is a totally new phenomenon, with effects and outcomes in the modern day unlike anything we've ever seen. The process of figuring it out will continue to hit dead ends, find new open doors and solutions to problems. That's how discovery and progress works.
Nothing wrong with that. It's not like this paper was some kind of breaking news headline that totally unravels everything you've been made to believe by corrupt scientists!!
It's just one of thousands of papers - recently it was noted about 23,000 published papers on this virus since January; and it's doubling every 20 days.
Does anyone honestly expect each and every one of them happens to have the correct answer or something?