Not a reliable source there.
And… only after looking at how unreliable a cite is, one has to look at how reliable the source it came from is. Even less reliable.
The Grayzone is a webshite founded by Max Blumenthal, a contributor to RT. It purports itself to be “a news and politics website dedicated to original investigative journalism on war and empire”, but it mostly promotes Assadist, Russian, Venezuelan, and Chinese propaganda. It is known for using ad hominem attacks by calling critics neocon shills, or Mccarthyites.