I don't know what the vast majority of songs I listen to are about. I have some genetic defect that makes it near impossible to hear lyrics. It all sounds like melody to me.
I doubt it's a real thing that has a name. I tried asking chatGPT about it and it said it's called melodic masking / auditory masking but I didn't really find any information that matches my experience.
It's not that I don't hear the vocals, I just struggle to register it as language. It just sounds more like yet another instrument.