Yeah, there's reason to be skeptical of that. From the post, it seems the baby is already born, which means he has been dealing with the pregnancy for several months. That could have been a solid justification as to why the last update took so long. However, he never mentioned it all that time, radio silence, and AFTER the last update eventually came out, he promised monthly updates, when he must have known he wouldn't have the time if he was going to be a father.
Sure, it's entirely possible that he didn't want to share the news with a bunch of randoms online back then, but now he feels that he has to, thats a possibility. But I still find it odd, that he never mentioned becoming a father while people were asking him if the game was abandoned or not.