Looking at whois history sites, it looks like the domain was owned by Tom Christiansen aka tchrist, which wrote Programming Perl, Learning Perl and the Perl Cookbook. The record wasn't supposed to expire until 2029, so not sure how the squatters got this domain.
Perhaps they pwned his e-mail acccount, or social-engineered their way to take control of his phone number. (Just guessing.)
There's too little information to draw conclusions at this point.