A little inside baseball, but mckinsey BA's are "free" to staff for the first, idk, 6 months for a team. Your first year is basically a tedious exercise in learning mckinsey lingo, meeting etiquette, and importantly in this context, model and deck building. Not saying the demo isn't cool, I want to try it out! But beating a first year BA at excel is like beating a summer intern at coding pre-LLMs.