The article reminds us that the Green nomination will not be official until and unless the delegates confirm it in Houston on 6 August.
While your humble blogmeister is an un-shut-up-able supporter and promoter of Stein's candidacy, the introvert in him wishes that the campaign had waited longer to make the announcement. This is mainly because there are four other recognized candidates vying for the nomination, all of whom are good folks, and one of whom is not shy about her displeasure at how Stein has operated as the presumptive nominee all along.
Despite any grumbling that might come from other Green candidates and their supporters, none can deny that Stein has run a well organized race thus far. She has also greatly improved not only her overall message since 2012 (and even since 2015), as well as how she delivers that message. She has taken that message on numerous media appearances in various platforms just since January, including today's life Facebook interview with Huffington Post (not yet posted on the site).
Also, in a sense, the timing of the announcement is excellent, given Stein's recent 5% showing in national polls.