[GENERAL] PostgreSQL Object-Oriented Database?

[Robert Pepersack]

Hi,
 
Thanks in advance for your help.
 
I have a lot of experience with object-oriented programming and relational 
databases, but I'm new to PostgreSQL.
 
My agency has a contractor that created a PostgreSQL database that he calls 
"object-oriented".  I noticed that the contractor has more than one value in a 
column separated by commas.  In the relational world, this obviously violates 
first normal form.  When I asked about it, he said that it's because PostgreSQL 
is an "object-oriented database".  I'm very skeptical.
 
Can someone tell me if this guy is right?
 
Thanks.