1) The Guardians article wasn't an official announcement made by Discovery or Warner Bros. It was a news article covering the merger between Discovery and Warner Bros. DC Comics wasn't mentioned because the writer chose to mention other properties from Warner. There isn't much to it to cause concerns about DC's future.
2) There was a video, I'm pretty sure it was a CNN video though not fully sure, but the CEO of Discovery directly mentioned characters like Superman and Batman. He seemed to be into the idea of owning those characters. You don't just merge with Warner Bros and not even consider their biggest movie property. Again I could be wrong with what video that was, but you can find the CNN video by simply googling "discovery and warnermedia cnn".
There's still a lot of unknowns, I get the trepidation, but there really hasn't been any new news to suggest something will go a certain direction or not.