Have a closer look at the article. I read it after posting here.
Argentine Foreign Minister Diana Mondino shared Mr Blinken's view, writing in a post on X, formerly Twitter: "We can all confirm, without a doubt, that the legitimate winner and President-elect is Edmundo González."
Ecuador, Uruguay, Costa Rica and Peru have also recognised Mr González as the president-elect...
[Machado] claimed her party's candidate, Mr Gonzalez, won by a landslide and Ms Machado said she could prove this because she had receipts from more than 80% of polling stations.
Ms Machado appealed for help, saying it was now up to the international community to decide whether to tolerate what she called an illegitimate government.
Ok. So the US says so, a number of states aligned with the US, and the Venezuelan opposition. Still no evidence.