It’s also possible that Disney yanked the synopsis circulating the web for other reasons, such as the information may be incorrect.
The synopsis was hidden, after all, and while it wasn’t done in the best possible manner, there may be a reason why fans weren’t meant to see it beyond the fact that it’s a spoiler.
For example, the Star Wars Resistance synopsis could be the original concept the show was constructed around, but somewhere along the line, the writing time may have decided to make the timeline a little further out.
Fan speculation and worry like this may have been why Disney was holding off on making the timeline news public prior to the series airing, as well as why the info has been scrubbed from the site since it was first discovered.