If you believe the child is yours, if you have committed acts with the mother that you know could have led to a child and indeed, believe did lead to the existence of the child in question, if you treated that child as your own, then it's your child, genetics or not.
If, on the other hand, you believe that the child the woman is carrying is not your child or possibly not your child, that is the time to raise the question and to establish paternity or non-paternity.
What a load of nonsense. You really are metaphor in reverse.
She cheated on him, had a child that was not his. He didn't initially know (child was only 2). He later missed a deadline by 2 months, that's all. He even (reportedly) had to pay her legal fees after she took him to court to get his money for a child she knew was not his. What do you actually need to hear before you are willing to just say it looks like a woman did bad? Imo, that's what we all should be saying, based on what we know.
The absurd
'death of western civilisation' thing is another matter, and arguably absurd. But this case on its own? Unless there are details we don't yet know, it's surely a no-brainer and there should be none of your mealy-mouthed, female-biased, anti-men apologetics imo.
Sure the "woman did bad". But the man did have a window of opportunity to fix it. He failed to do so. So while it does seem unfair, the law isn't that bad.
As background, here is a more detailed time table of events:
January 2016: The man finds out about the wife's infidelity and that he is not the father. Apparently the wife still had a relationship with the biological father, and had done so for the past three years. It's not clear how long after the incident this continued though.
March 2016: The man moves out of the house.
April 2016: The wife files for divorce.
May 2016: The man gets the DNA test results.
June 2016: The child turns 2 years old.
August 2016: The man files for annulment.
It seems that the man was distraught over the news (he started seeing a therapist who later would testify him having PTSD symptoms), and it really came to him as a surprise. At the time, according to his own words, he was still hoping to have some relationship with the child, which probably contributed to his tardiness. The woman on the other hand was later convicted in an unrelated case of embezzling her employer, so my gut feeling is that the man here is being sincere and the woman is in it for the money. From legal standpoint though, being a crybaby isn't a reason to miss deadlines, and there is no proof that she deliberately defrauded the man. Infidelity is not a crime.