Can an Aop Intexas Be Voided if Mother Knew There Might Be a "True" Biological Father

My question involves paternity law for the State of: Texas. My daughter is 4 years and 10 month old. She was born out of wedlock. My boyfriend at the time signed the AOP and was put on birth certificate. Two years later we were married. So, my now husband has been the Presumed father of her, with an AOP signed at the hospital. Now that my daughter is over four years old, her biological father has contacted me, and I allowed us to take a DNA test. It concluded it is his biological child, and he wants to visit with her and offer and support that I will allow. My husband if furious that I even spoke with him. My husband asked around and is under the impression that the bio father is "barred" from her life after 4 years in Texas? Is this true? Can a court decide differently? The bio father has threatened with a team of "Super Attorneys" if he cant see her AT ALL. I am not sure if they just want him to give them 50k and drag it through the courts to fight for no reason at all if my husband is grasping at straws. My husband is waiting on a copy of the AOP we signed. However, is that AOP void if I knew that there was another man that was very possible the father and the bio father could prove it, could it be voided? Is that perjury? I knew the bio father didn't want a child and I assured him that I wasn't going to ever ask him for a penny (and I haven't) and never would. He however isn't financially concerned with spending 50-100k on an attorney to get visitation and I really can't afford to fight. We didn't want to fight, and I told the bio father that he can see my daughter. We were on good terms and going to allow bio father to see her until my husband decided that the bio father is BARRED after four years and refuses to negotiate now based on the four year rule.

Can an Aop Intexas Be Voided if Mother Knew There Might Be a "True" Biological Father