I always thought this was a stupid restriction. You can't view the post while authenticated but you can view the post while unauthenticated.
It provides friction for further misbehaving. Imagine you blocked someone who has serious issues with people who #foobar. It's better for you if they can't easily find you and repost your content to their community who also hate #foobar. It's not perfect, but the friction helps prevent drive-by bad behaviour.
This is valid. I don't think it rises to the level of preventing them from seeing my public content. But perhaps a brake on their ability to repost it would be courteous.