Re: And it's all based on ALLEGATIONS!
I like Reuters, but they can be wrong too, especially as the article you link to was written BEFORE the documents were exposed.
Also: "Bellingcat is funded by the US government’s regime-change arm, the National Endowment for Democracy (NED), and is part of an initiative bankrolled by the British Foreign Office."
Here you go, just one of the leaked emails: https://wikileaks.org/opcw-douma/document/May-20-2019-email_raising_concerns/May-20-2019-email_raising_concerns.pdf