Footnote 350 could be referring to the January 2017 Mark Lyall Grant Communique questioning the credibility of Christopher Steele. #FISA https://thehill.com/opinion/white-house/446050-did-brits-warn-about-steeles-credibility-before-muellers-probe-congress https://twitter.com/CBS_Herridge/status/1248696457915498497

If it is the Lyall Grant Communique, then our allies still must be concerned. Cc: @realDonaldTrump https://www.cnn.com/2018/09/21/politics/trump-declassification-allies/index.html

I believe Cody Shearer's network, including a Turkish businessman, was purportedly infiltrated by RIS/FSB. Shearer in 2017 had been "crisscrossing Eastern Europe" "to secure the purported kompromat from a different Russian" (FSB?). https://www.theguardian.com/us-news/2018/jan/30/trump-russia-collusion-fbi-cody-shearer-memo https://www.nytimes.com/2018/02/09/us/politics/us-cyberweapons-russia-trump.html

According to the PSS, the interviewed sub-source responsible for "allegations concerning Michael Cohen" & "the meeting between @carterwpage and Igor Divyekin", would be the source of the Russian disinformation in Footnote 350, given it involved "the activities of Michael Cohen".

The Dossier depicts this Sub-source as a "Kremlin insider" "close to Presidential Administration Head, S. IVANOV". Persons issuing denials in the footnote could be the sub-source, Konstantin Kosachev, or Oleg Solodukhin. The sub-source would issue similar denials in August 2017.

I personally don't believe there was any concerted Russian effort to plant disinformation into Steele's reporting. I believe Steele and/or his Primary Sub-source embellished gossip and fabricated stories to create the entire product.