Despite being the most hated Niji wave by Holo tribalists, Luxiem ironically had basically nothing incriminating in that leak. The worst stuff in it was on Pomu (who gave us the "all out war" quote) and Fulgur (who said that Council wasn't as successful as Cover hoped). Vox was in it, but all he did was make a joke about how he's glad that Shu is in Niji because he's their tech support.
I doubt that had much of an impact on these Twitter interactions. HoloEN (and Stars) and NijiEN continued to interact on Twitter after the leak. In this case I think the more prolific interactions are mostly just due to the two gens debuting in the same week and both containing fairly outgoing, nice individuals. I don't really expect that this frequency will continue now that all the debuts are over. Plus if Iluna does collab with Tempus that's just going to lead to a round of "Cover will let their guys collab but won't let Kiara collab" discourse. And the fact that the closest relationship is still that between Kiara and "All Out War" Pomu makes me think the leak didn't have a big role in anything behind the scenes - which makes sense, as Kiara implicitly called it a nothing burger.