It is absolutely valid to warn about long term use, and NSAIDs in particular (I was lucky and had a gastroscopy before they'd done any serious damage, but they found significant erosion of my stomach lining due to NSAIDs), but acetaminophen/paracetamol isn't an NSAID (ibuprofen and aspirin, for example, are)

To be clear, it was nabumetone, celecoxib or meloxicam (at various times, not overlapping) for me.