Harvesting Triglavian technology, that’s what they’re doing.
I mean, not that you’d know that from asking them, as they’re unlikely to return communication and will probably open fire on you immediately. But yeah.
CONCORD having it’s own ship design is irrelevant. It’s acting, or at least acted as, a body representative of the four empires forged out of a shared interest in maintaining the peace of the Cluster. The people in CONCORD, at one point, were in many ways empire representatives who had temporarily put on a T-shirt. As it’s personal autonomy and power grew it became the organization we know today.
EDENCOM is much the same. It’s composed of all the Empires but everyone has their own motivations. Difference is I don’t expect EDENCOM to become fully autonomous in it’s own right anytime soon, more likely the Empires will steadily withdraw support over time and pour more resources into what they personally believe is best for fighting the Triglavians.
Just because the organization gets funding and manpower from the Big 4 does not mean it IS the Big 4.