Hylo, Yoki, and Emma kicked up a bit of drama last month by publicly complaining to Phase Connect's Twitter about Lumi using their models in some short April Fool's bit. Most people agreed there wasn't anything wrong with them not wanting Lumi to do this, but others also felt that because they did this publicly rather than talk to Phase in private, there were other motives behind this, which led to the above Discord screenshots being brought back into the light. Hylo in particular later went on to complain about being harassed and blamed Lumi for encouraging this type of behavior, of course showing zero proof of this. In the end, Hylo apologized and said she shouldn't have made this public, while Lumi seemingly was talked to by management, probably deleted their files, and went about her days normally, only vaguely joking about things.
As far as I remember, Pippa's only indirect involvement of this was noticeably unfollowing anyone on Twitter she was previously following that talked negatively about Lumi and Phase during this, such as Chibi (I think), Mana, and a few others.
As far as what this means now with Yuri, I don't know, but as I stated earlier, it definitely raises some eyebrows and questions.