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This does not sound correct. Or at least incomplete.
It also sounds dubious from the perspective that it would be virtually impossible to ascertain that it was the oxygen that placed a doctor at risk. There are so many things that are done for patients that are this sick that it would be difficult to separate the risk of oxygen from everything else that is being done.
If you can find a new article on a webpage that I could review, I would be glad to do so, but just on this level of information, it does not sound correct.
I can guarantee you that they use oxygen masks, but not with a ventilator.
How do I know anything?
My above answer applies.