?Is antifa responsible for the Amtrak derailment in Seattle Washington?

Is antifa responsible for the Amtrak derailment in Seattle Washington? In this video I show you proof that Antifa admitted to being responsible for sabotaging train tracks in Olympia Washington on their website called Itsgoingdown.Org. They posted an article to the website on April 20th 2017 that was then deleted. Using Archive.org I was able to retrieve the article which you can read for yourself by clicking the link below. In the article they discuss that they (#Antifa) are responsible for pouring concrete on the train tracks that lead out of the port of Olympia in Washington State. Does this mean that antifa is responsible for the Amtrak derailment in Seattle Washington? It could be or couldn't be. But they do admit that they responsible for pouring concrete on tracks in Olympia Washington which is not too far from Seattle. Obviously Antifa should be suspects in this case if there is found to be any tampering of Railway property in Seattle.

Here's a link to the Archive.Org website which has archive the original article from itsgoingdown.org: https://web.archive.org/web/20170711215654/https://itsgoingdown.org/olympia-wa-train-tracks-sabotage-stop-fracking-equipment/