Not necessarily... I never thought of them as married, more as just a dating couple. I also picture they're a comedy duo (like a Kenan and Kel, Drake and Josh, Pinkie Pie and Twilight, sort of deal). Of course this is my interpretation of the characters... Everyone's free to make up stories about them, which is pretty cool.
But yeah... no this was just a gag and not symbolic of my or anyone else's ideas about their marital status.