Spoilers Star Trek: Lower Decks 3x10 - "The Stars at Night"

But that's literally what canon means.

The only new thing is the format. Obviously no one posted things on social media back in the day because social media didn't exist. Facebook and Twitter weren't mainstream until a few years after Enterprise ended. However we still had people involved in production establishing stuff in other sources, reference books, interviews and the like. Hell, the head writer and co-creator of Voyager even wrote two Voyager novels. But they were never considered canon because they were not on screen. The same applies today in regards to whatever someone in production has tweeted.

Besides, even production personnel posting things on social media can still be wrong, like John Eaves and the infamous 25% thing. Best not to take anything at face value just because it comes from someone who works on the show.

 

Apparently they were considered canon in the writers room, until she left the show. I guess without her there to make sure they were followed they just ignored them.

 

Canon is what the IP rights holder says it is. Period. Whether we like it or not. On-duty Production staff (especially showrunners) and Paramount are the ultimate authority.

 

No one has claimed otherwise.

On-duty production staff and Paramount are the ones who tell us that if it ain't onscreen it ain't canon.