Yes that's how I see it. They had to stop treating so many people which is surely the very definition of it being overrun. And the reason for that is that so many elderly and vulnerable people were still catching it and needing hospital treatment as they had not for whatever reason isolated sufficiently.
Other diseases don’t threaten to overwhelm our medical facilities so obviously totally different scenarios . Unless we leave them to die an horrible death lockdown was the only outcome but of course it should have preceded an effective track and trace system soon after .