Ultra processed foods are clearly garbage. There is no nuance to this. There is no need for a deep study needed on unclear aspects of nutrition. They are plainly bad nutrition wise.
Breast milk is not an active debate. It’s not determined by “the majority” either. It is pretty clear that breast milk is better for a baby developmentally.
None of this actually supports your earlier assertion that lab grown food would have fundamentally different nutrition rules than other foods.
Due to antagonistic pleiotropy and short term reproductive selection you could even argue that novel foods have an advantage over the foods we've "adapted to" since our bodies never learned to make short term trade-offs with those foods.
Those skeptics should also be skeptical of the naturalistic fallacy.
In the ongoing debate surrounding breast milk and baby formula, the majority continues to favor breast milk as the optimal choice for infant nutrition.