Thank you. I think I had read those posts already but was getting confused by what the VFS website said versus the UK.gov site. I'm guessing that's what they're referring to when they say all the published info hasn't caught up.
It is confusing, especially when they don't update the changes in a timely manner.
Back in 2013, when they moved the processing of settlement applications from New York to Sheffield in the first place, they didn't update the online application with this information for several months, and it still told applicants to mail everything to Sheffield... so we had a number of people accidentally sending their documents to NYC, only for them to be mailed back to them a few weeks later with instructions to mail them to Sheffield!
And the deadline for mailing the documents to Sheffield was reduced from 2 weeks to 5 days back in September 2015, but the online application was still telling people it was 2 weeks even in 2018!
Ultimately though, the gov.uk website contains all the official information, laws and guidelines as set out by the UK government, while VFS global is a third-party commercial partner who handles the application submission process on behalf of UKVI.