The only unhealthy thing on that list is the honey BBQ sauce which, per Chick-fil-a's website, is 60 calories and 2 grams of sugar per pack:
https://www.chick-fil-a.com/nutrition-allergens
Assuming he's only eating a few packs of sauce, that sounds like a healthy meal. What's wrong with it?
Besides, what toddler do you know of will choose to eat a kale salad?
1. Chicken nuggets. Processed mystery meat.
2. BBQ sauce. Basically seasoned high fructose corn syrup.
3. Coke Zero. Artificial sweeteners can cause/aggravate insulin resistance.
Still a level down from fried chicken and chips, every step in the right direction counts.
In regards to Aspartame this isn't true. Or, at least, the Jury is still out. There's competing evidence from studies.