You say life long fan, but they started their career making music that was super poppy. This song would be perfect (all be it at a much lower production quality) on 2 Lefts or Anatomy. I could honestly hear the album transition from college kids into this.
There isnt a song in their catalog that is this inorganic musically. Lyrically, yes this is reminiscent of old RK, but I dont see how anyone can compare this musically to their other work, this is far and away the most boybandish song they have ever released.