All perfect praise be to Allah, The Lord of the worlds. I testify that there is none worthy of worship except Allah and that Muhammad is His slave and Messenger.
We do not see any harm in saying these lines; perhaps the lyricist means that sometimes things happen in life that make a person happy or sad, and this is a reality.
So expressing this idea is not considered looking down upon belief in Qadar (fate), and there is no harm in chanting it.
Allah knows best.