Yes, it’s an odd statement. The authors are all Harvard scientists, and I have checked what they post on Twitter, they aren’t anti vaccine cranks. Though one of them, Al Ozonoff, does try to engage with such people. Perhaps this is a concession in a similar vein of outreach. The Hill is a conservative news website. Perhaps they felt they had to get their own dubious science a mention, and that was the price of publication for the Harvard scientists?