I kind of doubt it, because the mother didn't inform the father of TH until he was what...15? My older brother went through a similar situation, only he supported his son until he was 2 and then the mother took off with him. She showed back up when my nephew was 14 or 15 and tried to sue my brother for support for all those years. My brother had proof that he involved the police in trying to find them over the years, so the judge only ordered support from the date of filing forward.
How can someone just spring a teenager on a man and expect payment for all the years he didn't even know the child existed? I would hope no judge would order such a thing.
Thank goodness he got a sensible Judge.
I had a female co-worker who got a divorce and in the papers she got custody and he paid child support. He is a great father and paid her on time every time and did a lot more than what was expected for his boys.
Then she decided about two years later that she no longer wanted to raise her kids. She had found a new man and had no time for her children. So they talked it over and she told him if he took them he wouldn't have to pay the child support every week. So he gladly raised his sons for 10 years after then.
Then one day he gets a letter in the mail from the Child Support Recovery Unit advising him that he owed thousands of dollars in back child support. Yep, she went down there after 10 years of him raising them totally and reported him.
He could even prove to the Judge that they lived with him fulltime (the boys testified for him and other witnesses) and he totally supported them and she didn't help with any of their support either. But the Judge said that didn't matter because his divorce papers stated that he was to pay her every week $$$$$ in child support.
Yeah she was a real piece of work.

His big mistake was he took her at her word instead of getting it in writing.
So he had to pay all the back child support and they still lived with him and are now in college. The Judge did stop the child support though from the day they appeared in court since he could prove she was not raising the children. He told J that he should have petitioned the court when he started raising them on his own in his own home. Why he ever trusted her to do the right thing I don't have a clue.
Years ago I had to deduct child support from one of the workers who's son was 37 years old at the time. He too said he wasn't aware of the child until he was advised he owed child support. He even had a DNA test done. He owed 46K+ dollars in back child support. He had to pay it all back. It also went on his credit report as owed.
Not knowing you are a parent does not stop the responsibility of paying child support. Rightly or wrongly, the day the child is born, whether the other parent knows about it or not starts the cash clock ticking if the parent lives away from the child.
I even believe I read where Tyler's father said he was paying for current support and trying to catch up on past support. That sucks!
Another strange child support case I heard about a few years ago was about a man who really thought the child he had been raising was his own but it turned out not to be true and the mother knew he wasn't the father all along. He petitioned the court saying since he was lied to about the child being his he felt he no longer should have to pay support. Wrong assumption. The Judge said that he certainly would because this father was the only father this child has ever known.
So I do believe he is going to have to pay it all back.