The country is in lockdown, so what would be the point of stopping people coming here? They aren’t going to be spreading the virus even if they have it.
Of course they are. They have to stay somewhere and wherever they stay they will come into contact with people. If they have it they will pass it on and it will spread. I have no idea who or why anyone is flying here unless as someone said they are stranded holidaymakers or expats returning home.