I don't particularly agree with that, as it would essentially require exponential change in biases for a population to be considered open-minded, which isn't how societys work. But even so, the study did actually show an increased rate of change towards positive sentiment corresponding with the boom in travel. Perceptions shifted from trending negative to trending increasingly positive during the period of inflection they describe.
My perception of the COVID years was... quite the opposite, at least outside of my immediate bubble. It felt like polarization and isolation increased more intensely that I'd ever seen. And the strong negative impact on conservative-leaning populations has been well documented.
oh wow, that is gorgeous