Babysitting my mom’s three cats. She left a box of Churu. They like them a lot. I was surprised. I thought it was just a few rare internet videos I have watched. Cats really like this.
I assume you've tried shredded/gravy wet foods? In my experience they're much more popular than the patés. My understanding is your vet is totally correct: it's really important for cats to get moisture from their food, so it's worth it to keep trying to find something your cat will eat!