I get it and I am fine that you thinking he did it. I am not trying to change anyone's mind since most people are already set one way or another without knowing the full set of facts (none of us do). Again, I am taking issue with anyone that says they cant understand why an innocent person would plead.
His penalty pleading WAS probation, a fine and entering a program. It seems unlikely to me that it would have been the same if he was found guilty. It sure seems like a simple google search will tell you that OK law would have been much more serious than what you think may have happened.
https://www.criminaldefenselawyer.com/resources/criminal-defense/domestic-violence/oklahoma-domestic-violence-laws-charges-penalt
Domestic abuse committed against a pregnant woman
If the crime of domestic abuse is committed against a pregnant woman and the offender knew of the pregnancy, the penalties can be extremely harsh. For a first offense, the crime is a misdemeanor punishable by up to one year in jail. If the offense is a second or subsequent conviction, the crime is a felony punishable by up to ten years in prison. If the mother miscarries as a result of the domestic abuse, however, or there is any injury to the unborn child, the crime is a felony for which the offender can be sentenced up to twenty years in prison.
Domestic abuse by strangulation
If a defendant commits assault and battery by strangulation or attempted strangulation against a domestic victim listed above, with intent to cause great bodily harm, he is guilty of a felony. A first offense of this crime is punishable by one to three years in prison or a fine up to $3,000, or both. The penalty for a second or subsequent offense is three to ten years in prison or a fine up to $20,000, or both.