Dell Latitude 7285 System BIOS version 1.2.2

According to https://www.dell.com/support/home/uk/en/ukbsdt1/product-support/product/latitude-12-7285-2-in-1-laptop/drivers?lwp=rt Dell Latitude 7285 System BIOS version 1.2.2 was last updated on 21 January 2019. This took me by surprise, since I had been using BIOS 1.2.2 for several weeks prior to the update on 21st January 2019. I did contact Dell's support to ask why I have been using a BIOS for several weeks before its release date. Rather than answering this very simple question, the support staff member cited that he cannot retrieve my account details and simply advised I keep up to date with drivers. As the support staff member appeared to be incapable of answering my very simple question, can anybody else answer this question?