This was in 1998, the laws against child porn then were more lax then.
https://www.sfgate.com/bayarea/article/Charges-shatter-Asimov-son-s-reclusion-3099867.php
According to this he was only facing 6 years in prison if convicted. I am sure there are lots of people facing six years in prison who plead guilty for probation. It happens every day, there was nothing unusual about it at all.
Pretty sure this autistic retard who lives on 3000 a month isn't going to any Hollywood parties, eyes wide shut or otherwise.