There's no denying that Star Trek: Discovery may be the least-liked show in Star Trek's history. It's not "bad" but many critics describe it as 'un-Star Trek'. It was dark, moody, depressing, and engaging, but in all the worst ways. The first two seasons felt like a show that was trying to be something that Star Trek never was.
It wasn't poorly done, but the show dramatically didn't understand who it's target audience was. They tried to change things up in season three, and it worked to a degree. However, the show had an uphill battle that it never really was able to climb. It's because of those issues that have caused the fandom to never fully embrace the series.
Some fans would love for it to be expunged from the timeline, but that doesn't seem likely. Or even possible. Yet, CosmicBook.com decided that they were going to boldly claim that the series was "erased" from the established canon. Instead, they argue, that Discovery now exists in another universe.
Which frankly, isn't true.
The argument is that the show takes place in a different universe because Star Trek: Lower Decks claimed the purple Klingons, seen first in the Star Trek Kelvin Timeline and later Discovery's first two seasons, are now canonically in a different universe. Which, isn't exactly true. Yes, it's true that Lower Decks showed Klingons changing their looks due to the multi-verse effects that the series was tackling, but that's not proof that Discovery is now a show in a different timeline.
After all, we know there's a prime James Kirk (William Shatner) and a Kelvin James Kirk (Chris Pine). So just because something exists in one universe doesn't mean it doesn't exist exists in the other. Both the Kelvin Timeline and the Prime Timeline have those ugly, purple, orc-Klingons.
We know that Discovery isn't beloved. We know that there's a lot that fans would change but Lower Decks doesn't have the pull to decaonize a series. Most fans aren't supporters of Discovery and you'd be hard to find a lot of people here who love Discovery. Yet, you can't ignore that it happened. It did.
So, until or unless Star Trek and its parent company come forward and remove Discovery officially from the prime timeline, nothing that Lower Decks says is to be held as the new standard.