TL;DR: WSL in the store is always WSL2. (WSL1 needs an Optional Windows Feature and cannot be Store installed.)
Also, that last paragraph does somewhat read like the death knell of WSL1 in that it implies all future features will be Store delivered (and thus WSL2).
New features haven't been added to WSL 1 for some time, but because of backwards compatibility guarantees, I would expect to see WSL 1 exist for many years.
