Color us a bit confused on this one. Linda Park has been cast on The Flash, with The CW double-alum Malese Jow sticking with the network to play the character. In DC comics, Park was a reporter who eventually became the wife of Barry’s protege and eventual Flash Wally West.
On the TV show, she will be “a quick-witted reporter for the Central City Picture News,” according to a report by THR. She’ll be a friend of Iris’s in her quest to become a journalist, while also separately befriending (and possibly being a love interest of?) Barry. She won’t show up until the second half of the season, with season 1 episode 12 being her first appearance.
But here’s where the confusion comes - in this screenshot, we see… yes, Linda Park, reporting from Central City on the Particle Accelerator’s power up on Arrow. She is a different age bracket, clearly than Jow or the rest of the Flash cast, and was basically an easter egg; it’s probably that it’s just going to be ignored, but worth pointing out none-the-less.