I've seen a screener of Dark Fate - here's my thoughts.

Right, but the current site : https://www.terminatordarkfatefilm.co.uk/ has nothing on rating. Nor does the fox site : http://www.fox.co.uk/terminator-dark-fate

Nor does the uk trailer https://www.youtube.com/watch?v=SDfBubPIEQY

The only thing I could find about its rating was this terminatorfans article. The latest comment states, " I took my daughter (13) to watch the latest Spiderman movie yesterday and the new Terminator movie trailer was shown. This suggests to me that it will be a 12A. "

Also, there's no red band trailer, so it may not actually be rated R after all. Avengers : Infinity War and End Game were both 12A/PG-13 and they have various characters die or get maimed. The trailer for Dark Fate seems to suggest that the only character getting graphically beat down is the Rev-9.

/r/Terminator Thread Parent