I love questions like this. It is the modern day equivalent of the ink blot test since the answers you get are more a reflection of the respondent's inner thoughts and biases than any factual info. I look forward to hearing what people say.
There are no studies examining throat fucking. There are a couple (literally) of case reports of the types of minor mucosal injuries to expect from oral sex, but case reports don't give the info you are asking about.
Anybody, no matter if they are an EMT,
internet doctor, or real physician, who pretends to know the answers are only revealing their own biased (perhaps even subconscious), unfounded thoughts.