"Opened to"--Once Sirius was exposed to Gallic technology and could get its hands on some of it and vice-versa--that would be a place where technological innovation occurred--particularly as it happened as a time of war.
Being K'hara shouldn't give you carte blanche to decide for all factions that "cloaks and jump drives are from Nomads"--it's possible that others might disagree. I would as an example argue that there can be alternate explanations developed--such as the one I gave.
Claiming that Nomads dissolve to useless goo when killed, that derelicts and artifacts are function less and then saying advanced tech comes from Nomads is having your cake and eating it too.
I understand "Nomads are Nomads" but was just making the point that a "different parts, different functions" approach gives some room for some difference in Nomad activities and purposes--pretty much like a program subroutine.