That doesn't explain why absolute free speech is necessary. If you are allowed expose violations of your voting rights, but not allowed to engage in hate speech

That doesn't explain why absolute free speech is necessary. If you are allowed expose violations of your voting rights, but not allowed to engage in hate speech... you still have the right to vote? But part of it is also the broader context: There's a contingent on the far-right who complain about their speed being limited as they actively campaign for stripping minorities of civil rights. I interpret the post as indirectly suggesting that siding with those minority groups means you are less committed to civil rights (because the right-wing folks are the primary ones concerned about speech restrictions, while minorities are concerned about everything). Which quite frankly is an absurd conclusion