C'mon, lets not confuse your personal narrative with historical fact. The post you provided distinctly states that Palestinian units entered first and Syrian units later. In fact, very shortly after the Palestinian units entered the Syrians were part of the Arab Deterrent Force with the permission of the Lebanese government.Wow. You live in an imaginary world.
1) Syria invaded in June 1976, months before any suspicious Arab League mandate. What you quoted even sates that Syria has to be forced into a ceasefire by the Arab League.
2) They continued to occupy until 2005.
At least you now admit that Syria was an illegal occupier. Maybe you can get around to criticizing them for it.
While they did not leave when asked in 1982, they did leave in 2005 without building settlements and transferring its population or demanding land swaps. How refreshing.