Thats true , British authors usually used term "hindustani" for people of Delhi , UP etc where Hindi/urdu was spoken........But broadly speaking, punjabis and sindhis were included in Hindi/indian catagory by locals as well as farangis.....
For Pashtuns , country beyond river indus was Hind/Hindostan...........Babur also enters into Hind when he crosses river indus to invade punjab and sher shah suri didnt proceed beyond attock as it was the boundary of india since times of delhi sultanates. Present day KPK and FATA were administered from Kabul by mughals, not lahore.
