From the same link:"First, a week ago the embassy of the United...

From the same link:

"First, a week ago the embassy of the United Arab Emirates was formally re-opened in a ceremony in Damascus - the first time a Gulf country re-established official relations with the Assad government since all GCC states first shuttered their embassies there in 2012. And more significant, following this Gulf nations are now reportedly leading efforts to readmit Syria into the Arab League after the organization expelled Damascus eight years ago when the conflict first began."

ZeroHedge refers to this article:

https://www.theguardian.com/world/2018/dec/26/arab-league-set-to-readmit-syria-eight-years-after-expulsion

You can bet the Gulf nations expelled Syria due to some arm twisting from the USA as the USA saw an opportunity for regime change.