So there's a few things to unpack here.
It is true, that female on male domestic violence in general, is massively under reported, it does happen, more often than one would think, personally, I was punched and slapped by a girlfriend on a couple of occasions, but I'm a bit old fashioned and don't really think anything of it, it was a couple of times over a 2 year period and I can't say I didn't do anything to precipitate it, believe me, however I digress.
In reality still, male on female violence is far more widespread, that doesn't discount what some males are experiencing, but its important to point that out, this is one study, not that I have any reason to doubt it, but in general, it remains true that male on female violence, especially in the domestic setting, far outweighs the opposite.
Thirdly one must also understand the motivations of the OP in posting such a study, he's someone with a seething hatred for women and someone who values them as much as he may value a doormat.