Yes. One of my least favoured memes of all time. I mean, ok that it does help reduce parents freaking out about getting vast quantities of food in before they are just a few months old... but imho it's just factually WRONG. Food before 1 is important for a) fun b) nutrition c) learning to eat skills (apparently, a critical window following which they don't as easily learn the techniques distinct from suckling and can then be more likely to get food aversion etc).
I do know folks who were so bought into this idea and related ones (like that breast milk is so perfect that the longer your baby went without any other form of nutrition the better) that they thought children didn't need ANY food beyond bm till they were 2 (years). I've read of families not offering anything to 9, 10 months because they believe that preserves "virgin gut" etc.
Thankfully most babies are sensible and tend to just grab whatever they see and this sends a pretty clear signal to parents they are ready to eat.
A recent UNICEF report on infant feeding highlighted that worldwide, a third of babies are introduced to solid food too late and don't have the minimum solid food diversity to complement breast milk
data.unicef.org/topic/nutrition/infant-and-young-child-feeding/#
There is also an excellent who book on guiding principles for complementary feeding of breastfed babies www.who.int/nutrition/publications/guiding_principles_compfeeding_breastfed.pdf which highlights the nutritional importance of solid food from 6 months - says around 200 calories a day would typically need to come from solids from 6-8 months and increasing after that. And the author says
"Because of the rapid rate of growth and development during the first two years of life, nutrient needs per unit body weight of infants and young children are very high. Breast milk can make a substantial contribution to the total nutrient intake of chil- dren between 6 and 24 months of age, particularly for protein and many of the vitamins. However, breast milk is relatively low in several minerals such as iron and zinc, even after accounting for bioavailability. At 9-11 months of age, for example, the proportion of the Recommended Nutrient Intake that needs to be supplied by complementary foods is 97% for iron, 86% for zinc, 81% for phosphorus, 76% for magnesium, 73% for sodium and 72% for calcium (Dewey, 2001)."
Given this, I think the "food before 1 is just for fun" is deeply wrong and unscientific.