Got a prompt reply from NRG:
Thank you for contacting NRG Park! This just seems like a simple misunderstanding. There will be a separate queue for the Red Zone ticket holders, but it will be located at the Ford Gate, which is the same gate as the GA queue can enter through. I’ll reach out to the forum and let them know as well. We absolutely would never strip you of something you purchased.
We hope this answers your questions, but please let us know if there is anything else we can assist you with!
NRG Park Guest Services