If they're eating a reasonable breakfast and dinner, having instant ramen for lunch isn't anything close to a death sentence, it's simply not ideal.
But, odds are, the person who eats instant ramen 5 lunches a week isn't going home to a balanced dinner and likely eats fast food or frozen dinners most nights, which is why I suggested adding a few inexpensive extras.
A cup of pre-shredded bagged cabbage would add ~$0.50 to a ramen meal. If they do 30 minutes of meal prep on a sunday they could pre-portion a full portable soup container with all of the extras for the week and be ready to go for maybe an extra dollar a day.