Tony Zipparro says the headline numbers for Big Tech earnings like Nvidia (NVDA), Microsoft (MSFT), and Amazon (AMZN) show "phenomenal" growth. The problem he sees lies in how the numbers will affect GDP, along with raising questions on how these earnings pave a clear path to AI ROI. Tony also explains that the growth picture faces a key headwind: a K-shaped economy where the bottom third of Americans are struggling.