Would you defend your step son?

We got emergency custody of my step son 6 months ago because of abuse from his biological mother. Her daughters were also taken away but she got custody of them back 2 months ago. Since he was taken away she's kind of gone on a smear campaign saying she never abused him and he's lying and that he was very violent and had outburst and was diagnosed with ODD. She also posted facts about how untreated ODD can turn is ASPD. Antisocial personality disorder or being a psychopath/sociopath. He hasn't been allowed to talk to his sisters since she got custody of him back. He's been with us for 6 months and has never gotten violent. Also we've taken him to 4 psychologist and they all say he doesn't have ODD. Not to mention when they pulled his medical records there was nothing in there about an ODD diagnosis. My husband even reached out to his ex to find out where he got diagnosed and she never responded. All he's been diagnosed with is PTSD and anxiety disorder. She's talking so poorly about a 14 year old boy. And there were also several signs of abuse. My husband's lawyers had pictures from the bruises he came to school with. I hate that his own mother seems to be clearly lying on him. I want to publicly defend him but also don't know if it's my place. Would you?