You have clearly a cursory knowledge of these subjects and should leave the detailed analysis to others. Nuance is king.
First-gen 5G chipsets definitely sucked more juice, especially for mmwave usage, but Apple will be using a second-gen Qualcomm X55 chipset. Next year they will likely be using the X60 chipset which will improve further and be based on TSMC 5nm design.
Of course in certain usage situations the new iPhone will use more battery, but we don't know how well the X55 chipset will perform with Apple's proprietary antenna design. Apple will surely compensate by either increasing efficiency elsewhere, or adding extra battery capacity, or both. For many people, especially outside of mmwave areas, this new phone will likely offer better reception (Qualcomm vs Intel) AND better battery life. Looking at a single component is meaningless without putting it in context of overall battery usage (screen, processor, memory, software optimization, antenna design, etc.)