But accounts are already pseudonymous?

Here’s where I am at:

I can check if my votes are federated correctly by checking if any of my votes are suppressed or votes in my name are made up. If my instance sends a different random token with each vote, I can still do that, as long as I know which tokens are assigned to my votes.

But vote tallies can also be manipulated by making up new votes through fake/bot accounts. If a vote can be connected to posts, this can be checked to some degree. Say, if an instance has a lot of voters that never post, that indicates a problem.

I don’t see how the second thing with E2EE.