I don't trust Avenatti at all, and I suspect this whole thing is a publicity stunt he planned himself.
I watched the video and payed close attention to both his hands, no signs of any bruising/marks.
This would not be the first time he has payed someone to make false allegations to further an agenda. Now he will be a Democrat hero if he is exonerated and the media will claim Trump tried to take him out. It would raise his profile significantly.