It can affect the fighters because of the climate of the island itself but if this will really happen then they will need to work hard for this to happen since most of the countries are in a lockdown. Where should the fight happen .

Like you said, I don't think that this will happen too because the health of the fighters is more important than the money. Fighters will not risk their lives because they might be infected too with the virus. I'm not expecting this too happen and maybe he is just bluffing .