Idk. I'm pretty sure they are just using the GAB name here to spite AEW and Cody. But also, from a business perspective, it does make sense. You wouldn't want to let the trademark lapse and let your competitor use it for any kind of gain. And just the fact that they are using the GAB to name to counter-program AEW makes me much more convinced that it's deliberate. If they had brought it back as a regular PPV or whatever, it wouldn't be so obvious. Nonetheless, they are within their rights to do it, so call it petty if you want, but it's probably not worth being mad over. 
