I had three kids in short succession, so I know something about the topic. This idea that someone, in particular in their 20s or 30s walks around like a zombie during the day after having a kid is a bit overstated. Call me sexist, but more often than not mom is the one waking up multiple times per night if she is breastfeeding. In addition, as money is not an issue in this case, they may have an overnight doula or nurse that helps with feedings. What I know is that I had three kids under the age of 4 and I woke up and went to work every morning without the ability to have a nap during the day. This guy is a professional athlete. His conditioning, nutrition, etc. is off the charts, especially compared to the rest of us. My guess is that it doesn't affect his play at all, and if anything it may improve it because he is riding an incredible high right now.
The only caveat, of course, is if there is ever a problem with a baby right after birth. Anyone who has been in that situation knows that the rest of your life - job, responsibilities, whatever - rightfully becomes a complete afterthought.