Zero substance? It was reported by Ukrainska Pravda (and Ukraine is far from being famous for its freedom of press) not by some Russian propaganda outlet. It's the same as saying that WSJ citing "sources" has zero substance.
Regardless, you can believe that the West did not provide any assurance to Ukraine during the Istanbul talks and that Russia has blown its own pipeline. It's your right.
It was speculated as a possibility by that article, but then it was looked into by others, quite thoroughly, and the narrative fell apart. That happens, you know.
The Foreign Affairs article in the aforementioned thread has a pretty good writeup about the whole thing, if you are interested.
You can believe that Russia has blown its own pipeline
You can change the subject as many times as you want, and speculate, falsely, about what you think other people believe about random topics, all day long if you want.
But this has absolutely no bearing on what we were just talking about.
Which is a myth - oft repeated, but with precisely zero substance.
See also: https://news.ycombinator.com/item?id=41813032