Unlucky
WHERE HAVE YOU BEEN
Gast needed to be tracked down, but even if they didn't know where he was, the game implied he was still giving them research. It's not until Hojo shows up to take Aerith that Gast proclaims that he's severing all ties with the Shinra. (At least in English)
I re-watched the cutscenes. I don't think he's giving them research (why would he when he already left.. and they didn't know where he was right?). He was merely recording it. Hojo took the video with him when he discovered it.
He did say that line though ('I'm severing all ties with the Shinra!'). Probably a translation error?