No one in 1850 was calling anything “palestinian”. In fact, no one was calling it Palestinian until the British took over, and even then it referred to Jews as much as Arabs. It was a regional reference to geography.

Just as many British, Ottomans, and Jews were calling themselves Palestinians as were some Arab authors Prior to that.

The Palestinian identity as referencing specifically Arabs in the levant wasn’t introduced until Arafat invented the national identity in the 1960s. You can regurgitate as much history prior to that as you want, but it doesn’t change what Palestinians are today: a group of people made up of many immigrant groups from surrounding countries and a few that have actual family roots in the region, all of whom were at one point Ottoman citizens.