Eh, it's just a callback at all those non-Holo watchers chiding Dooby for being "too quiet" during the collab with Filian/Doki/Bao, saying she should "let loose" since she's "not in a corpo anymore" when anyone who's watched her as Ame pretty much knew this is just pretty much the norm for her during collabs of more than 2 people. That's not even factoring the who-can-be-louder-look-at-me energy between Doki and Filian during that collab that anyone who's not that naturally loud/genki would have to proactively shout just to get a word in between Filian's screaming and Doki's laughing.Given Shiori exists, the line in HoloEN is pretty further out than how Fauna behaved and Fauna could have been far more edgy but she never really did.