According to the Wikipedia page, I don't think he was an independent journalist. He had connections with the Saudi government and other organizations.
Quote: "After his second resignation, Khashoggi maintained ties with Saudi Arabian elites, including those in its intelligence apparatus. In 2015, he launched the satellite news channel Al-Arab, based in Bahrain outside Saudi Arabia, which does not allow independent news channels to operate within its borders. The news channel was backed by Saudi Arabian billionaire Prince Alwaleed bin Talal and partnered with U.S. financial news channel Bloomberg Television, it was also rumored to have received financial support from the King of Bahrain, Hamad Bin Isa Al-Khalifa.[69] "
Quote: "In December 2018, The Washington Post revealed that Khashoggi's columns "at times" were "shaped" by an organization funded by Saudi Arabia's regional nemesis, Qatar, including by proposing his topics, giving him drafts, goading him, and giving him research."
I am not saying it is wrong to be a political dissident, but those should disqualifying you from being called as a "journalist", right?