Nope it doesnt.
Wolverine did drop one f bomb in first class and magneto sliced off people's brains. that movie still stayed pg 13, the adult and maturity of first class also comes from the plot of the film and still...a pg 13 rating, if fox really wanted to have made that R, it would have been very easy to do that but they didn't.
the same here can apply to dawn of justice cut, if you are actually going to have a war movie with Darkseid, and want to portray a more realistic kind of violence to reflect the war. Your r rating could be very much earned. Snyder does have good r rating records with 300 and watchmen, no doubt this is what he wanted.
I am just happy, I called it about r rating, I remember when people thought I was crazy when I said r rating varies with each movies.