That has nothing to do with it. Almost all CPU's these days have integrated graphics, which makes no difference at all. The integrated graphics are generally weak and intended for basic computing. When you install a GPU card, the integrated graphics will be disabled and the system will run all it's graphics tasks on the installed GPU and not the CPU's integrated graphics. You do NOT need to replace the cpu in order to upgrade your graphics and whoever told you that clearly does not understand how modern hardware functions at all.
If you install a GPU card in the slot as we discussed, the cpu will then become ONLY a CPU, and will no longer be in charge of the graphics.