In most of these cases, it is highly unlikely that any significant number of the patients will withhold their consent: so to not ask it is basically saying "we can't be bothered", there's no obvious scientific basis for such a waiver. When patients are incapacitated there are equivalent frameworks which take their personal circumstances into consideration.
Time is of the essence here. If I was put in the situation these researcher are in I would act first and take the risk of being put on trial later. Real ethics means sometimes you have to do more than just follow rules.
I do believe it's troubling times for everyone near this virus and we need as much information of the virus as possible. This is going past a regular 'patient confidentiality' line and into a 'prevent a possible disaster from occurring by getting on top of it soon'.
GP only said the death rate was lower (which necessarily means the infection rate is higher, not lower, assuming all the deaths used in the reported rate are real deaths associated with the disease of concern.)
There might be cause for some concern like for any form of disease, but calling it a war is ridiculous and inappropiate to describe the situation. Even a well intentioned reading of the statement leaves much to wish for.
The common cold kills more than 50,000 people a year. 90% of media reports are intentionally worded to dramatize the situation, so I don't think anything warrants this classification with respect to the people deceased.
This reaction is precisely the reason why some might think about restricting information about infections or simliar health hazards to the public.
If we are lucky the problem is not as bad as it appears, but so far nothing I have seen suggests this is anything other than very, very serious.