"Real Punjabi" is spoken in central Punjab Jhelum is no where near. Though one can learn any language that does not change your ethnicity.
Your mistaken my friend and very much so. Have you ever heard of Mian Sahib, the great Punjabi poet? He was from Jhelum. Have a listen to some of his work and tell me that's not Punjabi. Jhelum is a pretty large city. Not sure how many pinds exactly. But where we're from, there is no Potwari spoken.