No. Reddit is a single website. Win are each their own self-contained communities, but there is no reason we can't find a way to make it simpler for users and promote the other sites at the same time--just like people would rather go to news aggregators rather than having to go to 20 different news sites every day.
I discovered Meta after posting this and thought that would be a better place to ask. Turns out that we may get this after all.
https://communities.win/c/Meta/p/11R4Sa9rpA/any-plans-for-a-win-aggregator/