Even if the third party reliably proves your article is published october 1, what prevents the scammer from publishing an article with a fake date of june 21 on plain www-internet? It's not like the scammer is going to publish the article hash on any block chain.

Something like this can only work if all news publishers always publish the article hash and those that don't will simply not get crawled and not be valid as proof in DMCA takedowns.