You are absolutely right about music being fundamental to the human experience, universally. But parent isn't denying that at all.
Parent is talking about the BUSINESS of popular music -- not music full stop. The business of popular music absolutely _has_ co-opted music itself as a means of marketing other products. That's how the money is made and it's the only reason you are aware of any popular music artists at all.
Yes people listen to popular artists because the music makes them feel certain ways. But from the business' perspective that only matters insofar as it enables the business to capture the attention of the listener, to sell things. Are you aware of how many product placements litter nearly all popular songs? Why do you think country music -- which is a massive market -- is hyper-focused on getting drunk, drinking beer all day, driving pickup trucks, etc.? Do you know how much money there is in that?