So, just to say off the top, I think that Martha Karolyi is a terrible person and I agree that she that she is an abusive coach that should not be held up as a good example. But there is a lot of misinformation in this post. First, no survivor has come forward and directly said that they told her about the allegations about Nassar (as opposed to many people at MSU who were directly told, such as Kathie Klages who has been charged with lying to the police). Some have made comments like "she knew everything that went on at that camp, like what I ate for breakfast that morning, how could she not have known". Which is an excellent point. But most have focused more on the environment she created that allowed the abuse to flourish because it created the environment where people were afraid to speak up. Second, I don't believe the FBI is investigating the Karolyis. The Wikipedia link mentions the Texas Rangers investigating them, which already happened and the Texas Rangers seemed to fall under Martha's spell and specifically mentioned in a press conference back in the summer that the Karolyis were not being charged. The Wikipedia page hasn't been updated since then. Third, Aly Raisman and Simone Biles didn't speak out in court about Martha. Simone didn't even speak in court or send a written statement and to my knowledge, has never said anything bad about Martha. She did say that she was dreading going back to the Karolyi Ranch where she was abused when she went public about being abused, which resulted in it being closed less than a week later. Aly has been very mixed on Martha and has not been one of the athletes that has sued the Karolyis. The athletes that have been more publicly critical of the Karolyis and are suing the Karolyis include Mattie Larson, Jamie Dantzscher, and Sabrina Vega. Mattie and Jamie were probably the most vocal at Nassar's sentencing hearing.Marta Karolyi was responsible for setting up the training system that enabled Larry Nassar to sexually abuse over two hundred young US gymnasts over a decade or more, and is also alleged to have both deliberately turned a blind eye to allegations made against him by survivors of his abuse, and created and enforced a physically and mentally abusive training environment at the US team's training camp, which she and her husband ran (according to the Wikipedia page I linked to above, they're currently under investigation by the FBI for this). If you remember seeing news stories about gymnasts including Aly Raisman and Simone Biles speaking out in court about an abusive coach, this is what it was about.
Anyway, the overall point is correct that the Karolyis both suck.