Well James took a degree in nutritional science, and spent a good number of years using that knowledge to advise people on eating habits. Then in 2014 Julian commissioned James to find the foods and ratios for a nutritionally complete powder meal. Then they started "bagging up oats peas and seeds and selling it for " £22.50 pound a bag. 
Your maths is wrong, but otherwise yes.
It works out at £1.33 a meal, if purchased in bulk. Its worth buying if you want to eat it.