Looking at that, it doesn't seem like you can actually get Bitwarden from F-Droid? That looks like instructions to set up a third-party repository (hosted by Bitwarden)?
The page didn't mention anything about reproducible builds. (Doesn't mean they aren't using it though, but that would be internal.)
The page didn't mention anything about reproducible builds. (Doesn't mean they aren't using it though, but that would be internal.)