Actually it's not nonsense at all. An indoor meet and greet would be risky even if people took their masks off for 30 seconds. Sure, it's low risk if one person does it, but groups of people, doing it over and over again? Outdoors would be less risky, of course, but there is still some risk involved. If they used alternating spots outdoors it would be even better, as that would give the droplets time to descend, and any aerosol time to disperse.