Today’s GOP insanity

[Rajvik]

That is not a poll tax, a poll tax is a requirement for you to pay a fee just to be able to vote. Here what you have is someone having to finish the monetary part of their sentence. You see, when you are convicted of a crime there are court costs and restitution that are part of the sentence that you are required to pay. All this law does is make it clear where it wasn't before, that you are also required to pay these fines as well as having served your time.
From the first article

The new law requires people with serious criminal histories to fully pay back fines and fees to the courts before they become eligible to vote.