Syria with the Asad regime is the closest ally of Iran and it's not ever going to bee allied with Saudi. Egypt is an eternal basket they just want $$.
Saudi Arabia has ended lots of very harmfull policies in recent time. There is a fundamental change. And Saudi Arabia has more money than Iran. In addition Saudi Arabia has abandoned the Syrian war. Only Turkey, Russia, Iran & USA hold positions there. The war in Yemen runs badly and the support is crumbeling. Lots of Syrians didn't like the Iranian presence so much. Even supporters of Assad. In addition Syria needs money for rebuilding the country. Iran needs its money in the future for their own country. The Trump sanctions make it more difficult for Iran to finance.
I would very much like if this report is true.