From Twitter: OPCW issues Fact-Finding Mission report on #ChemicalWeapons use allegation in Al-Yarmouk, #Syria. Report concludes no reasonable grounds chemicals were used as a weapon in October 2017 incident reported to OPCW by the Government of Syria.
And just a few days earlier a report concluded that ISIS were the real perpetrators all along:
OPCW identifies ISIL as perpetrators of 2015 chemical attack in Marea, #Syria.
Summary on Twitter: https://twitter.com/OPCW/status/1760727877354414316
In conclusion: the West was lying all along about Assad (which all of us here already knew) and now there’s undeniable proof from an official source that you can show to anyone still peddling the lie.
I found a YouTube link in your comment. Here are links to the same video on alternative frontends that protect your privacy: