The guy has no idea what he's talking about. The virus is not playing this game by itself but against humans. When the host is dumb then the virus can play out based on how fast it infects, incubates and kills the host. In this case, despite a high R0 and a long incubation time, man is fighting this with social distancing meaning that the virus can't burn itself out. What the prof is suggesting is letting everyone get infected. Sure, that could be done, but at what cost? Say 1/2 the population 3.5billion people at 1% morality that's still 35 million dead.