(adsbygoogle = window.adsbygoogle || []).push({}); How does one unpack this with Flatz's gttool? Can you delete all the Vision GT videos?

Flatz's original tool wasn't directly designed to do that. It was designed to just unpack gt.vol..

The source he published, however, has all needed parts to do what you're looking for (IIRC with the later added non re-factored parts).
Don't get me wrong with this, but I won't further comment on that.

If you figure out how to delete them please let me know! I am in dire need of more storage on my CFW PS3.