It's actually a she, she was seen on manhwa reunions, like authors of most abusive stories sadly it's a woman.
So you really need me to introduce you to Gengoroh Tagame? This is not by a mile a very abusive story. At least he has all his limbs and dick intact.
You are mixing genres up. This is what very abusive looks like in Yaoi/BL, what you talk about is eroguro, which mixes erotic content with gore and it's a whole other genre and for other kind of people. If you like that content this kind of thing might be light for you, but again, what you talk about is not the same genre as this.
Does author-nim has kink? I'm really wondering how is he in real life..