Did you read the same post? The 4 year old child is distressed and doesn't trust his grandmother's food. That's 100% a problem and can have a real impact on the kids relationship with his family.

Sounds like it's about the child and his relationship with his grandmother. A good parent should be nurturing important family relationships. Sounds like OP is doing just that.

Cooking food for someone is an act of love, especially if it's something special from a grandparent. I'd argue it's less about the food and more about what the food symbolises.

Either way, A 4 year old is distressed about food from people who love him; because his mother is lying to him. Theres no way that's ok.

Adding in context based on situations completely unrelated doesn't make much sense either.