That’s from Dunmore’s. Dunmore’s required slaves to take up arms with the Loyal government.
Philipsburg doesn’t. It was a general emancipation. And like Lincoln’s it was issued as a war measure.
Neither emancipation was the causus belli. Both wars were intended to put down rebellions that were seeking independence.
You must not read your own links, because they say otherwise.
“The proclamation extended the scope of Dunmore’s Proclamation, issued four years earlier by Virginia’s last Royal governor, Lord Dunmore, granting freedom to slaves in Virginia willing to serve the Royal forces. The new document, issued from Clinton’s temporary headquarters at the Philipsburg Manor House in Westchester County, New York, proclaimed all slaves in the newly established United States belonging to American Patriots free, regardless of their willingness to fight for the Crown.[3] It further promised protection, freedom and land to any slaves who left their master.[4]”
https://en.m.wikipedia.org/wiki/Philipsburg_Proclamation
It ONLY applied to slaves of those in rebellion. Is was NOT a general abolition of slavery as an institution.