https://wccftech.com/apple-watch-series-1-series-2-not-updating-watchos-7/

Apple previewed its watchOS 7 update during the WWDC 2020 keynote but not all models previously released by the company will receive the update. If you currently own the Apple Watch Series 1 or the Apple Watch Series 2, then it won’t be getting updated to watchOS 7.

What this means is that the newer models, such as the Apple Watch Series 3 and later will be getting updated to watchOS 7 so if you want to experience the newest features, you’re going to have to upgrade down the road. Before previewing watchOS 7, Apple had only dropped software support for the original Apple Watch and it was only a matter of time before the newer models would be added to the list.