Indeed, Senior Dutch Perl programmers have left the company as they couldn't take this exploitation any more. The aim of the company management is to get developers from other countries who are unaware/ignorant of this dog treatment. They are trying very hard to stop their bad reputation from spreading but as you mentioned the developer community is closely knit and it doesn't take long for the word to spread.
What is sad though is Ovid-who is a reputable member of the Perl community, still recruits for them despite having worked for Booking and got burnt out for exactly those reasons that the blog talks about.