Kevin Tsujihara became CEO of Warner Bros. Entertainment on March 2013, and the article you linked said that he made this 'reversal' soon after taking on that role. So while this reversal did open the "DC vault" from under the tight control of WB's film division, it's not something that just happened this month.
This policy reversal is, for example, the reason why The Flash was even created as a TV show in the first place while still being on the docket for a film in 2018, and it's why we have Gotham, Supergirl, Constantine, etc. However, this doesn't mean we'll suddenly start seeing Batman show up in Star City, as this is still the same group that took Deadshot and the Suicide Squad off the table for Arrow appearances due to the film.