The Pentagon jumped the shark with the Russia and Iran propaganda a long time ago.
Maybe there is something to the story and maybe there isn’t. From the Gulf of Tonkin to Syrian chemical poisoning, time and time again we find out that at best there is no real proof, or worst a lie.
At this point anything Laurie Mylroie says is taken with a grain of salt.
Right or wrong, here is recent discussion. I’m not qualified to assess this.
Russia warns of split in chemical arms body
http://dsquareclick.blogspot.com/2018/11/russia-warns-of-split-in-chemical-arms.html
Russian challenge to chemical weapons watchdog rejected
https://www.nzherald.co.nz/world/news/article.cfm?c_id=2&objectid=12163510