It's implied that they got their tech from the Hurq invasion, yes. But that's no different from how the Narn in B5 got their tech from the Centauri.
It was the same for the Kzinti from the "Known Space" series too, the justification for why the primitive humans kept beating them despite advanced tech. But even the humans needed aliens to give them their more advanced tech in the "Known Space" series.
It was the same for the Kzinti from the "Known Space" series too, the justification for why the primitive humans kept beating them despite advanced tech. But even the humans needed aliens to give them their more advanced tech in the "Known Space" series.