Cut milk to make baby eat more?

A close friend of mine has a 9.5 month old that wasn't eating much solids, so they decided to reduce her milk intake. She now only gets two bottles a day aprox 16oz, one in the morning and one before bed. She said that she's eating more now and seems fine. But I thought that food was just for fun until 12 months and that formula/breastmilk is still the most important 🤔 I know its none of my business but I think there are other ways to help a baby eat more solids than cutting out all their milk. Or at least let the baby decide when they want to stop drinking as much. Does anyone else agree with me or do you think it's normal.