Hmm, digging into it you're both correct and incorrect. The 5th Aegis trade CG was the one that unlocked C3s:
https://forums.frontier.co.uk/showthread.php/391800-Fifth-Aegis-Initiative-Trade
However, it was bugged so Frontier gave us the rewards for tier 1 even though technically we didn't do enough to unlock it even if the bugs were fixed.
https://forums.frontier.co.uk/showt...-–-Trade-Community-Goal-early-closure/?page=1
Personally I feel with the increased Thargoid threat there could be another CG or two to up production and distribution to make it more available.... How cool would a reverse CG be, pick up this cargo at this station and distribute. More credits for longer distances like rare goods and each station/outpost/base can take only 10,000T of deliveries before being "full". You cannot dump or abandon the material but as soon as you pick it up you get the CG reward credit for doing it.
It'd be something different anyway.