It is correct. It means at this moment people may think George Floyd has died in vain, but in the future his death will be proved to be of value and meaning, and this moment of general public perception seems yet to fully happen.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .